swift234

[swiftc] Add test case for crash triggered in swift::TypeChecker::applyUnboundGenericArguments(swift::UnboundGenericType*, swift::SourceLoc, swift::DeclContext*, llvm::MutableArrayRef<swift::TypeLoc>, bool, swift::GenericTypeResolver*)

Stack trace:

```
swift: /path/to/swift/include/swift/AST/Decl.h:2439: swift::Type swift::TypeAliasDecl::getUnderlyingType() const: Assertion `!UnderlyingTy.getType().isNull() && "getting invalid underlying type"' failed.
8  swift           0x0000000000ea84f9 swift::TypeChecker::applyUnboundGenericArguments(swift::UnboundGenericType*, swift::SourceLoc, swift::DeclContext*, llvm::MutableArrayRef<swift::TypeLoc>, bool, swift::GenericTypeResolver*) + 1321
9  swift           0x0000000000ea7e7f swift::TypeChecker::applyGenericArguments(swift::Type, swift::SourceLoc, swift::DeclContext*, swift::GenericIdentTypeRepr*, bool, swift::GenericTypeResolver*) + 431
13 swift           0x0000000000ea864e swift::TypeChecker::resolveIdentifierType(swift::DeclContext*, swift::IdentTypeRepr*, swift::OptionSet<swift::TypeResolutionFlags, unsigned int>, bool, swift::GenericTypeResolver*, llvm::function_ref<bool (swift::TypeCheckRequest)>*) + 158
15 swift           0x0000000000ea9564 swift::TypeChecker::resolveType(swift::TypeRepr*, swift::DeclContext*, swift::OptionSet<swift::TypeResolutionFlags, unsigned int>, swift::GenericTypeResolver*, llvm::function_ref<bool (swift::TypeCheckRequest)>*) + 164
16 swift           0x0000000000ea854a swift::TypeChecker::validateType(swift::TypeLoc&, swift::DeclContext*, swift::OptionSet<swift::TypeResolutionFlags, unsigned int>, swift::GenericTypeResolver*, llvm::function_ref<bool (swift::TypeCheckRequest)>*) + 42
17 swift           0x0000000000f6086f swift::IterativeTypeChecker::processResolveInheritedClauseEntry(std::pair<llvm::PointerUnion<swift::TypeDecl*, swift::ExtensionDecl*>, unsigned int>, llvm::function_ref<bool (swift::TypeCheckRequest)>) + 159
18 swift           0x0000000000f3f22d swift::IterativeTypeChecker::satisfy(swift::TypeCheckRequest) + 493
19 swift           0x0000000000f3f3b9 swift::IterativeTypeChecker::satisfy(swift::TypeCheckRequest) + 889
20 swift           0x0000000000e3af40 swift::TypeChecker::resolveRawType(swift::EnumDecl*) + 64
21 swift           0x00000000010848bf swift::NominalTypeDecl::prepareConformanceTable() const + 351
22 swift           0x0000000001084b7f swift::NominalTypeDecl::getImplicitProtocols(llvm::SmallVectorImpl<swift::ProtocolDecl*>&) + 15
23 swift           0x0000000000e3b52c swift::TypeChecker::checkInheritanceClause(swift::Decl*, swift::GenericTypeResolver*) + 1180
24 swift           0x0000000000e3e47f swift::TypeChecker::validateDecl(swift::ValueDecl*, bool) + 527
29 swift           0x0000000000e43ed6 swift::TypeChecker::typeCheckDecl(swift::Decl*, bool) + 150
33 swift           0x0000000000ea3736 swift::TypeChecker::typeCheckTopLevelCodeDecl(swift::TopLevelCodeDecl*) + 134
34 swift           0x0000000000e671bd swift::performTypeChecking(swift::SourceFile&, swift::TopLevelContext&, swift::OptionSet<swift::TypeCheckingFlags, unsigned int>, unsigned int) + 1149
35 swift           0x0000000000cb9d8f swift::CompilerInstance::performSema() + 3087
37 swift           0x000000000078ab9b frontend_main(llvm::ArrayRef<char const*>, char const*, void*) + 2523
38 swift           0x0000000000785645 main + 2837
Stack dump:
0.	Program arguments: /path/to/swift/bin/swift -frontend -c -primary-file validation-test/compiler_crashers/28262-swift-typechecker-applyunboundgenericarguments.swift -target x86_64-unknown-linux-gnu -disable-objc-interop -module-name main -o /tmp/28262-swift-typechecker-applyunboundgenericarguments-a3dcd2.o
1.	While type-checking 'S' at validation-test/compiler_crashers/28262-swift-typechecker-applyunboundgenericarguments.swift:8:4
2.	While resolving type d<T> at [validation-test/compiler_crashers/28262-swift-typechecker-applyunboundgenericarguments.swift:8:20 - line:8:23] RangeText="d<T>"
<unknown>:0: error: unable to execute command: Aborted
<unknown>:0: error: compile command failed due to signal (use -v to see invocation)
```