swift234

[swiftc] Add 💥 case (😢 → 51, 😀 → 5090) triggered in swift::createDesignatedInitOverride(…)

Add crash case with stack trace:

```
5  swift           0x0000000000f21393 swift::createDesignatedInitOverride(swift::TypeChecker&, swift::ClassDecl*, swift::ConstructorDecl*, swift::DesignatedInitKind) + 2003
6  swift           0x0000000000ea76a3 swift::TypeChecker::addImplicitConstructors(swift::NominalTypeDecl*) + 3187
13 swift           0x0000000000ea1416 swift::TypeChecker::typeCheckDecl(swift::Decl*, bool) + 150
16 swift           0x0000000000f08594 swift::TypeChecker::typeCheckClosureBody(swift::ClosureExpr*) + 244
17 swift           0x0000000000f342dc swift::constraints::ConstraintSystem::applySolution(swift::constraints::Solution&, swift::Expr*, swift::Type, bool, bool, bool) + 876
18 swift           0x0000000000e8fa31 swift::TypeChecker::typeCheckExpression(swift::Expr*&, swift::DeclContext*, swift::TypeLoc, swift::ContextualTypePurpose, swift::OptionSet<swift::TypeCheckExprFlags, unsigned int>, swift::ExprTypeCheckListener*) + 769
21 swift           0x0000000000f0721a swift::TypeChecker::typeCheckFunctionBodyUntil(swift::FuncDecl*, swift::SourceLoc) + 346
22 swift           0x0000000000f0707e swift::TypeChecker::typeCheckAbstractFunctionBodyUntil(swift::AbstractFunctionDecl*, swift::SourceLoc) + 46
23 swift           0x0000000000f07c43 swift::TypeChecker::typeCheckAbstractFunctionBody(swift::AbstractFunctionDecl*) + 179
25 swift           0x0000000000ec36c1 swift::performTypeChecking(swift::SourceFile&, swift::TopLevelContext&, swift::OptionSet<swift::TypeCheckingFlags, unsigned int>, unsigned int, unsigned int) + 1281
26 swift           0x0000000000c590c9 swift::CompilerInstance::performSema() + 3289
28 swift           0x00000000007d73e9 swift::performFrontend(llvm::ArrayRef<char const*>, char const*, void*, swift::FrontendObserver*) + 2857
29 swift           0x00000000007a3428 main + 2872
Stack dump:
0.	Program arguments: /path/to/swift/bin/swift -frontend -c -primary-file validation-test/compiler_crashers/28331-swift-createdesignatedinitoverride.swift -target x86_64-unknown-linux-gnu -disable-objc-interop -module-name main -o /tmp/28331-swift-createdesignatedinitoverride-86a961.o
1.	While type-checking declaration 0x50f5a00 at validation-test/compiler_crashers/28331-swift-createdesignatedinitoverride.swift:9:5
2.	While type-checking expression at [validation-test/compiler_crashers/28331-swift-createdesignatedinitoverride.swift:9:6 - line:9:48] RangeText="{class a{enum S<U:a{class B:a{init}}class a"
3.	While type-checking 'a' at validation-test/compiler_crashers/28331-swift-createdesignatedinitoverride.swift:9:7
<unknown>:0: error: unable to execute command: Segmentation fault
<unknown>:0: error: compile command failed due to signal (use -v to see invocation)
```