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Issue Description:

Assertion failed: (value == expected), function operator(), file /Users/buildnode/jenkins/workspace/oss-swift-package-macos/swift/lib/IRGen/GenProto.cpp, line 2739.
Please submit a bug report (https://swift.org/contributing/#reporting-bugs) and include the project and the crash backtrace.
Stack dump:
0. Program arguments: /Library/Developer/Toolchains/swift-DEVELOPMENT-SNAPSHOT-2021-01-19-a.xctoolchain/usr/bin/swift-frontend -frontend -interpret /Users/nate/Desktop/mutating-extension.swift -enable-objc-interop -sdk /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX11.0.sdk -color-diagnostics -enable-experimental-concurrency -target-sdk-version 11.0 -module-name main

1. Apple Swift version 5.4-dev (LLVM a9b8270, Swift 1d7d282)
2. While running user code "/Users/nate/Desktop/mutating-extension.swift"
3. While evaluating request IRGenRequest(IR Generation for module main)
4. While emitting IR SIL function "@$s4mainyyYcfU_SiyYcfu_".
   for expression at [/Users/nate/Desktop/mutating-extension.swift:11:19 - line:19:3] RangeText="numbers.withAsyncUnsafeMutableBuffer { buffer -> Int in
   var sum = 0
   for i in buffer.indices {
   sleep(1)
   defer
   { buffer[i] += sum }
   sum += buffer[i]
   }
   return sum
   "
   0 swift-frontend 0x000000010cc1b9b5 llvm::sys::PrintStackTrace(llvm::raw_ostream&) + 37
   1 swift-frontend 0x000000010cc1ac15 llvm::sys::RunSignalHandlers() + 85
   2 swift-frontend 0x000000010cc1bf86 SignalHandler(int) + 262
   3 libsystem_platform.dylib 0x00007fff204d4d7d _sigtramp + 29
   4 swift-frontend 0x000000010f7e9e92 cmark_strbuf__initbuf + 204605
   5 libsystem_c.dylib 0x00007fff203e2720 abort + 120
   6 libsystem_c.dylib 0x00007fff203e19d6 err + 0
   7 swift-frontend 0x000000010cd50f13 llvm::Value* llvm::function_ref<llvm::Value* (swift::irgen::GenericRequirement)>::callback_fn<void save<swift::irgen::NecessaryBindings::save(swift::irgen::IRGenFunction&, swift::irgen::Address, swift::irgen::Explosion&) const::$_5>(swift::irgen::NecessaryBindings const&, swift::irgen::IRGenFunction&, swift::irgen::Address, swift::irgen::NecessaryBindings::save(swift::irgen::IRGenFunction&, swift::irgen::Address, swift::irgen::Explosion&) const::$_5)::'lambda'(swift::irgen::GenericRequirement)>(long, swift::irgen::GenericRequirement) (.cold.1) + 35
   8 swift-frontend 0x00000001086ffbdb llvm::Value* llvm::function_ref<llvm::Value* (swift::irgen::GenericRequirement)>::callback_fn<void save<swift::irgen::NecessaryBindings::save(swift::irgen::IRGenFunction&, swift::irgen::Address, swift::irgen::Explosion&) const::$_5>(swift::irgen::NecessaryBindings const&, swift::irgen::IRGenFunction&, swift::irgen::Address, swift::irgen::NecessaryBindings::save(swift::irgen::IRGenFunction&, swift::irgen::Address, swift::irgen::Explosion&) const::$_5)::'lambda'(swift::irgen::GenericRequirement)>(long, swift::irgen::GenericRequirement) + 123
   9 swift-frontend 0x00000001086f8ce9 swift::irgen::emitInitOfGenericRequirementsBuffer(swift::irgen::IRGenFunction&, llvm::ArrayRef<swift::irgen::GenericRequirement>, swift::irgen::Address, llvm::function_ref<llvm::Value* (swift::irgen::GenericRequirement)>) + 217
   10 swift-frontend 0x00000001086f7702 swift::irgen::NecessaryBindings::save(swift::irgen::IRGenFunction&, swift::irgen::Address, swift::irgen::Explosion&) const + 114
   11 swift-frontend 0x000000010861d83c (anonymous namespace)::AsyncCallEmission::setArgs(swift::irgen::Explosion&, bool, swift::irgen::WitnessMetadata*) + 2860
   12 swift-frontend 0x0000000108793f7e (anonymous namespace)::IRGenSILFunction::visitFullApplySite(swift::FullApplySite) + 3246
   13 swift-frontend 0x0000000108778a7f (anonymous namespace)::IRGenSILFunction::emitSILFunction() + 7983
   14 swift-frontend 0x00000001087765f3 swift::irgen::IRGenModule::emitSILFunction(swift::SILFunction*) + 1523
   15 swift-frontend 0x00000001086511db swift::irgen::IRGenerator::emitLazyDefinitions() + 1819
   16 swift-frontend 0x000000010873afd7 swift::IRGenRequest::evaluate(swift::Evaluator&, swift::IRGenDescriptor) const + 2263
   17 swift-frontend 0x0000000108775c4d swift::GeneratedModule swift::SimpleRequest<swift::IRGenRequest, swift::GeneratedModule (swift::IRGenDescriptor), (swift::RequestFlags)9>::callDerived<0ul>(swift::Evaluator&, std::__1::integer_sequence<unsigned long, 0ul>) const + 157
   18 swift-frontend 0x0000000108775b6e swift::SimpleRequest<swift::IRGenRequest, swift::GeneratedModule (swift::IRGenDescriptor), (swift::RequestFlags)9>::evaluateRequest(swift::IRGenRequest const&, swift::Evaluator&) + 14
   19 swift-frontend 0x0000000108746af8 llvm::Expected<swift::IRGenRequest::OutputType> swift::Evaluator::getResultUncached<swift::IRGenRequest>(swift::IRGenRequest const&) + 408
   20 swift-frontend 0x000000010873c190 swift::performIRGeneration(swift::ModuleDecl*, swift::IRGenOptions const&, swift::TBDGenOptions const&, std::_1::unique_ptr<swift::SILModule, std::1::default_delete<swift::SILModule> >, llvm::StringRef, swift::PrimarySpecificPaths const&, llvm::ArrayRef<std::1::basic_string<char, std::1::char_traits<char>, std::_1::allocator<char> > >, llvm::GlobalVariable**) + 576
   21 swift-frontend 0x000000010849965d swift::RunImmediately(swift::CompilerInstance&, std::_1::vector<std::1::basic_string<char, std::1::char_traits<char>, std::1::allocator<char> >, std::1::allocator<std::1::basic_string<char, std::1::char_traits<char>, std::1::allocator<char> > > > const&, swift::IRGenOptions const&, swift::SILOptions const&, std::1::unique_ptr<swift::SILModule, std::_1::default_delete<swift::SILModule> >&&) + 349
   22 swift-frontend 0x0000000108461711 performCompileStepsPostSILGen(swift::CompilerInstance&, std::_1::unique_ptr<swift::SILModule, std::_1::default_delete<swift::SILModule> >, llvm::PointerUnion<swift::ModuleDecl*, swift::SourceFile*>, swift::PrimarySpecificPaths const&, int&, swift::FrontendObserver*) + 1953
   23 swift-frontend 0x0000000108460d4c performCompileStepsPostSema(swift::CompilerInstance&, int&, swift::FrontendObserver*) + 636
   24 swift-frontend 0x0000000108455978 swift::performFrontend(llvm::ArrayRef<char const*>, char const*, void*, swift::FrontendObserver*) + 5224
   25 swift-frontend 0x00000001083f1c32 main + 866
   26 libdyld.dylib 0x00007fff204ab591 start + 1
   27 libdyld.dylib 0x000000000000000d start + 18446603339974396541
   fish: '/Library/Developer/Toolchains/s...' terminated by signal SIGABRT (Abort)