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Issue Description:

I have a Xcode project for a framework.

There are 2 targets in this project:

• Spin: defines the abstractions for a reactive feedback loop (some protocols and there type erasures)

• Spin.Combine:is an implementation of the abstractions defined in the Spin target, by extending AnyPublisher to conform to the protocols. This target depends on the Spin target.

Repro steps:

• Step 1: Compile the Spin target

• Step 2: Compile the Spin.Combine target. The compiler fails with a Segmentation fault 11 error (due to the `spy` function in the extension of `AnyPublisher`

• Step 3: comment the `spy` function and compile the Spin.Combine target. The compiler succeeds.

There was no issue at all when using with Xcode 10.3 and the Swift 5 compiler.

Here is the stack trace:

1. While emitting IR SIL function "@$s7Combine12AnyPublisherV05Spin_A00D07CommandRzs5NeverORs_AA0C06StreamRpzAJ_5ValueAE08ReactiveG0PQZAJ_6OutputAaIPRTzrlE3spy8functionAE0B8ProducerCyACyxAHGxSo17OS_dispatch_queueCAA0B11CancellableCAwE0M0ADxAeFHD1__AkaIHD2_HCg_Gyxc_tF".

for 'spy(function🙂' (at /Users/twittemberg/Development/Contributions/Spin/Spin/Spin/Spin.Combine/AnyPublisher+Spin.swift:49:12)

2. While mangling type for debugger type 'AnyProducer<AnyPublisher<τ_0_0, Never>, τ_0_0, DispatchQueue, AnyCancellable>'

0 swift 0x0000000105fc8eb3 PrintStackTraceSignalHandler(void*) + 51

1 swift 0x0000000105fc8686 SignalHandler(int) + 358

2 libsystem_platform.dylib 0x00007fff69f8eb5d _sigtramp + 29

3 swift 0x0000000102b312f1 swift::Evaluator::checkDependency(swift::AnyRequest const&) + 449

4 swift 0x0000000102b4c58f swift::GenericSignature::getConformanceAccessPath(swift::Type, swift::ProtocolDecl*) + 31

5 swift 0x0000000102aa7768 swift::Mangle::ASTMangler::appendConcreteProtocolConformance(swift::ProtocolConformance const*) + 1784

6 swift 0x0000000102aa4893 swift::Mangle::ASTMangler::appendRetroactiveConformances(swift::SubstitutionMap, swift::ModuleDecl*) + 179

7 swift 0x0000000102aa3e05 swift::Mangle::ASTMangler::appendRetroactiveConformances(swift::Type) + 389

8 swift 0x0000000102aa2cb0 swift::Mangle::ASTMangler::appendType(swift::Type, swift::ValueDecl const*) + 8864

9 swift 0x0000000101e3e3c9 (anonymous namespace)::IRGenDebugInfoImpl::getOrCreateType(swift::irgen::DebugTypeInfo) + 1449

10 swift 0x0000000101e3da63 (anonymous namespace)::IRGenDebugInfoImpl::createParameterTypes(swift::CanTypeWrapper<swift::SILFunctionType>) + 931

11 swift 0x0000000101e3cbaf (anonymous namespace)::IRGenDebugInfoImpl::emitFunction(swift::SILDebugScope const*, llvm::Function*, swift::SILFunctionTypeRepresentation, swift::SILType, swift::DeclContext*) + 3167

12 swift 0x0000000101e5573e swift::irgen::IRGenModule::emitSILFunction(swift::SILFunction*) + 2750

13 swift 0x0000000101d038e0 swift::irgen::IRGenerator::emitGlobalTopLevel() + 1712

14 swift 0x0000000101e34065 performIRGeneration(swift::IRGenOptions&, swift::ModuleDecl*, std::_1::unique_ptr<swift::SILModule, std::_1::default_delete<swift::SILModule> >, llvm::StringRef, swift::PrimarySpecificPaths const&, llvm::LLVMContext&, swift::SourceFile*, llvm::GlobalVariable**) + 1189

15 swift 0x0000000101c2078a performCompile(swift::CompilerInstance&, swift::CompilerInvocation&, llvm::ArrayRef<char const*>, int&, swift::FrontendObserver*, swift::UnifiedStatsReporter*) + 36682

16 swift 0x0000000101c14034 swift::performFrontend(llvm::ArrayRef<char const*>, char const*, void*, swift::FrontendObserver*) + 6820

17 swift 0x0000000101ba15a3 main + 1219

18 libdyld.dylib 0x00007fff69da33d5 start + 1

19 libdyld.dylib 0x000000000000004d start + 2519059577

error: Segmentation fault: 11 (in target 'Spin.Combine' from project 'Spin')