swift234

[SourceKit] Add test case for crash triggered in swift::GenericTypeParamType::get(unsigned int, unsigned int, swift::ASTContext const&)

Stack trace:

```
found code completion token A at offset 169
5  swift-ide-test  0x0000000000aab4e6 swift::GenericTypeParamType::get(unsigned int, unsigned int, swift::ASTContext const&) + 54
9  swift-ide-test  0x000000000095bf6a swift::TypeChecker::checkConformance(swift::NormalProtocolConformance*) + 282
13 swift-ide-test  0x0000000000931ad7 swift::TypeChecker::typeCheckDecl(swift::Decl*, bool) + 151
16 swift-ide-test  0x000000000097937a swift::TypeChecker::typeCheckClosureBody(swift::ClosureExpr*) + 218
17 swift-ide-test  0x00000000009b157c swift::constraints::ConstraintSystem::applySolution(swift::constraints::Solution&, swift::Expr*, swift::Type, bool, bool, bool) + 812
18 swift-ide-test  0x000000000091721b swift::TypeChecker::typeCheckExpression(swift::Expr*&, swift::DeclContext*, swift::Type, swift::ContextualTypePurpose, swift::OptionSet<swift::TypeCheckExprFlags, unsigned int>, swift::ExprTypeCheckListener*) + 683
20 swift-ide-test  0x00000000009794c6 swift::TypeChecker::typeCheckTopLevelCodeDecl(swift::TopLevelCodeDecl*) + 134
21 swift-ide-test  0x0000000000900e5d swift::typeCheckTopLevelCodeDecl(swift::TopLevelCodeDecl*) + 1117
34 swift-ide-test  0x0000000000ae0244 swift::Decl::walk(swift::ASTWalker&) + 20
35 swift-ide-test  0x0000000000b6aa8e swift::SourceFile::walk(swift::ASTWalker&) + 174
36 swift-ide-test  0x0000000000b69cbf swift::ModuleDecl::walk(swift::ASTWalker&) + 79
37 swift-ide-test  0x0000000000b43372 swift::DeclContext::walkContext(swift::ASTWalker&) + 146
38 swift-ide-test  0x000000000085c43a swift::performDelayedParsing(swift::DeclContext*, swift::PersistentParserState&, swift::CodeCompletionCallbacksFactory*) + 138
39 swift-ide-test  0x000000000076b3e4 swift::CompilerInstance::performSema() + 3316
40 swift-ide-test  0x0000000000714b43 main + 33379
Stack dump:
0.	Program arguments: swift-ide-test -code-completion -code-completion-token=A -source-filename=<INPUT-FILE>
1.	While walking into decl declaration 0x4933e30 at <INPUT-FILE>:3:1
2.	While type-checking expression at [<INPUT-FILE>:3:1 - line:5:7] RangeText="{protocol A{func b
}enum B:A{let s=b
let A{"
3.	While type-checking 'B' at <INPUT-FILE>:4:2
```