swift234

[SourceKit] Add test case for crash triggered in swift::TypeChecker::checkConformance(swift::NormalProtocolConformance*)

Stack trace:

```
found code completion token A at offset 149
swift-ide-test: /path/to/swift/lib/Sema/CSApply.cpp:148: swift::Type swift::constraints::Solution::computeSubstitutions(swift::Type, swift::DeclContext *, swift::Type, swift::constraints::ConstraintLocator *, SmallVectorImpl<swift::Substitution> &) const: Assertion `(conforms || firstArchetype->getIsRecursive() || isOpenedAnyObject(replacement) || replacement->is<GenericTypeParamType>()) && "Constraint system missed a conformance?"' failed.
13 swift-ide-test  0x000000000095db8f swift::TypeChecker::checkConformance(swift::NormalProtocolConformance*) + 2079
17 swift-ide-test  0x0000000000931d17 swift::TypeChecker::typeCheckDecl(swift::Decl*, bool) + 151
20 swift-ide-test  0x000000000097a89a swift::TypeChecker::typeCheckClosureBody(swift::ClosureExpr*) + 218
21 swift-ide-test  0x00000000009b2abc swift::constraints::ConstraintSystem::applySolution(swift::constraints::Solution&, swift::Expr*, swift::Type, bool, bool, bool) + 812
22 swift-ide-test  0x00000000009173fb swift::TypeChecker::typeCheckExpression(swift::Expr*&, swift::DeclContext*, swift::Type, swift::ContextualTypePurpose, swift::OptionSet<swift::TypeCheckExprFlags, unsigned int>, swift::ExprTypeCheckListener*) + 683
23 swift-ide-test  0x00000000009184a0 swift::TypeChecker::typeCheckBinding(swift::Pattern*&, swift::Expr*&, swift::DeclContext*) + 112
24 swift-ide-test  0x0000000000918649 swift::TypeChecker::typeCheckPatternBinding(swift::PatternBindingDecl*, unsigned int) + 265
26 swift-ide-test  0x000000000092d136 swift::TypeChecker::validateDecl(swift::ValueDecl*, bool) + 3974
27 swift-ide-test  0x0000000000991743 swift::createImplicitConstructor(swift::TypeChecker&, swift::NominalTypeDecl*, swift::ImplicitConstructorKind) + 451
28 swift-ide-test  0x0000000000937053 swift::TypeChecker::addImplicitConstructors(swift::NominalTypeDecl*) + 1299
31 swift-ide-test  0x0000000000931d17 swift::TypeChecker::typeCheckDecl(swift::Decl*, bool) + 151
32 swift-ide-test  0x00000000008fde22 swift::performTypeChecking(swift::SourceFile&, swift::TopLevelContext&, swift::OptionSet<swift::TypeCheckingFlags, unsigned int>, unsigned int) + 1474
33 swift-ide-test  0x000000000076b802 swift::CompilerInstance::performSema() + 2946
34 swift-ide-test  0x0000000000715107 main + 33239
Stack dump:
0.	Program arguments: swift-ide-test -code-completion -code-completion-token=A -source-filename=<INPUT-FILE>
1.	While type-checking 'A' at <INPUT-FILE>:3:1
2.	While type-checking expression at [<INPUT-FILE>:3:20 - line:3:34] RangeText="{enum S<T{case"
3.	While type-checking 'S' at <INPUT-FILE>:3:21
```