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Issue Description:

The following project crashes swift build with the following error:

swift: /home/buildnode/jenkins/workspace/oss-swift-5.1-package-linux-ubuntu-18_04/swift/include/swift/AST/Types.h:2693: swift::AnyFunctionType::Param::Param(swift::Type, swift::Identifier, swift::ParameterTypeFlags): Assertion !t || !t->is() && "set flags instead"' failed. Stack dump: 0. Program arguments: /home/wiml/swift-lang/swift-5.1-DEVELOPMENT-SNAPSHOT-2019-05-29-a-ubuntu18.04/usr/bin/swift -frontend -c -primary-file /home/wiml/src/swiftder/minimize/CompilerCrashExample/src/OtherFile.swift /home/wiml/src/swiftder/minimize/CompilerCrashExample/src/main.swift -emit-module-path /home/wiml/src/swiftder/minimize/CompilerCrashExample/.build/x86_64-unknown-linux/debug/CompilerCrashExample.build/OtherFilepartial.swiftmodule -emit-module-doc-path /home/wiml/src/swiftder/minimize/CompilerCrashExample/.build/x86_64-unknown-linux/debug/CompilerCrashExample.build/OtherFilepartial.swiftdoc -emit-dependencies-path /home/wiml/src/swiftder/minimize/CompilerCrashExample/.build/x86_64-unknown-linux/debug/CompilerCrashExample.build/OtherFile.d -emit-reference-dependencies-path /home/wiml/src/swiftder/minimize/CompilerCrashExample/.build/x86_64-unknown-linux/debug/CompilerCrashExample.build/OtherFile.swiftdeps -target x86_64-unknown-linux -disable-objc-interop -sdk / -I /home/wiml/src/swiftder/minimize/CompilerCrashExample/.build/x86_64-unknown-linux/debug -enable-testing -g -module-cache-path /home/wiml/src/swiftder/minimize/CompilerCrashExample/.build/x86_64-unknown-linux/debug/ModuleCache -swift-version 5 -Onone -D SWIFT_PACKAGE -D DEBUG -color-diagnostics -enable-anonymous-context-mangled-names -module-name CompilerCrashExample -o /home/wiml/src/swiftder/minimize/CompilerCrashExample/.build/x86_64-unknown-linux/debug/CompilerCrashExample.build/OtherFile.swift.o -index-store-path /home/wiml/src/swiftder/minimize/CompilerCrashExample/.build/x86_64-unknown-linux/debug/index/store -index-system-modules 1. While type-checking 'baz()' (at /home/wiml/src/swiftder/minimize/CompilerCrashExample/src/OtherFile.swift:8:14) 2. While type-checking statement at [/home/wiml/src/swiftder/minimize/CompilerCrashExample/src/OtherFile.swift:8:40 - line:10:5] RangeText="{ let r: T1.T2 = .foo(Value1[self.bar()]) " 3. While type-checking declaration 0x74f7a60 (at /home/wiml/src/swiftder/minimize/CompilerCrashExample/src/OtherFile.swift:9:9) 4. While type-checking expression at [/home/wiml/src/swiftder/minimize/CompilerCrashExample/src/OtherFile.swift:9:24 - line:9:47] RangeText=".foo(Value1[self.bar()]" 5. While type-checking expression at [/home/wiml/src/swiftder/minimize/CompilerCrashExample/src/OtherFile.swift:9:28 - line:9:47] RangeText="(Value1[self.bar()]" 6. While type-checking expression at [/home/wiml/src/swiftder/minimize/CompilerCrashExample/src/OtherFile.swift:9:29 - line:9:46] RangeText="Value1[self.bar()" 7. While type-checking expression at [/home/wiml/src/swiftder/minimize/CompilerCrashExample/src/OtherFile.swift:9:29 - line:9:46] RangeText="Value1[self.bar()" #​0 0x00000000044cd6a4 PrintStackTraceSignalHandler(void*) (/home/wiml/swift-lang/swift-5.1-DEVELOPMENT-SNAPSHOT-2019-05-29-a-ubuntu18.04/usr/bin/swift+0x44cd6a4) #​1 0x00000000044cb2fe llvm::sys::RunSignalHandlers() (/home/wiml/swift-lang/swift-5.1-DEVELOPMENT-SNAPSHOT-2019-05-29-a-ubuntu18.04/usr/bin/swift+0x44cb2fe) #​2 0x00000000044cdab8 SignalHandler(int) (/home/wiml/swift-lang/swift-5.1-DEVELOPMENT-SNAPSHOT-2019-05-29-a-ubuntu18.04/usr/bin/swift+0x44cdab8) #​3 0x00007f98d77fddd0 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x12dd0) #​4 0x00007f98d6c6c077 gsignal /build/glibc-B9XfQf/glibc-2.28/signal/../sysdeps/unix/sysv/linux/internal-signals.h:84:10 #​5 0x00007f98d6c4d535 abort /build/glibc-B9XfQf/glibc-2.28/stdlib/abort.c:81:7 #​6 0x00007f98d6c4d40f get_sysdep_segment_value /build/glibc-B9XfQf/glibc-2.28/intl/loadmsgcat.c:509:8 #​7 0x00007f98d6c4d40f __tls_get_addr /build/glibc-B9XfQf/glibc-2.28/intl/loadmsgcat.c:970:34 #​8 0x00007f98d6c5d142 (/lib/x86_64-linux-gnu/libc.so.6+0x32142) #​9 0x0000000000ead8a7 swift::constraints::ConstraintSystem::getTypeOfMemberReference(swift::Type, swift::ValueDecl*, swift::DeclContext*, bool, swift::FunctionRefKind, swift::constraints::ConstraintLocatorBuilder, swift::DeclRefExpr const*, llvm::DenseMap<swift::GenericTypeParamType*, swift::TypeVariableType*, llvm::DenseMapInfoswift::GenericTypeParamType*, llvm::detail::DenseMapPair<swift::GenericTypeParamType*, swift::TypeVariableType*> >) (/home/wiml/swift-lang/swift-5.1-DEVELOPMENT-SNAPSHOT-2019-05-29-a-ubuntu18.04/usr/bin/swift+0xead8a7) #10 0x0000000000eae82b swift::constraints::ConstraintSystem::resolveOverload(swift::constraints::ConstraintLocator, swift::Type, swift::constraints::OverloadChoice, swift::DeclContext*) (/home/wiml/swift-lang/swift-5.1-DEVELOPMENT-SNAPSHOT-2019-05-29-a-ubuntu18.04/usr/bin/swift+0xeae82b) #11 0x0000000000e33231 swift::ASTVisitor<(anonymous namespace)::ConstraintGenerator, swift::Type, void, void, void, void, void>::visit(swift::Expr*) (/home/wiml/swift-lang/swift-5.1-DEVELOPMENT-SNAPSHOT-2019-05-29-a-ubuntu18.04/usr/bin/swift+0xe33231)`