[swiftc] Add 💥 case (😢 → 55, 😀 → 5099) triggered in swift::Type::transform(…)

Add crash case with stack trace:

```
swift: /path/to/swift/lib/AST/ArchetypeBuilder.cpp:2049: auto swift::ArchetypeBuilder::mapTypeIntoContext(Module *, swift::GenericParamList *, swift::Type, swift::LazyResolver *)::(anonymous class)::operator()(swift::Type) const: Assertion `genericParamsDepth >= depth' failed.
9  swift           0x0000000001123b74 swift::Type::transform(llvm::function_ref<swift::Type (swift::Type)>) const + 36
10 swift           0x0000000001123e10 swift::Type::transform(llvm::function_ref<swift::Type (swift::Type)>) const + 704
11 swift           0x0000000000fefeeb swift::ArchetypeBuilder::mapTypeIntoContext(swift::ModuleDecl*, swift::GenericParamList*, swift::Type, swift::LazyResolver*) + 155
12 swift           0x0000000000f322e7 swift::createDesignatedInitOverride(swift::TypeChecker&, swift::ClassDecl*, swift::ConstructorDecl*, swift::DesignatedInitKind) + 119
13 swift           0x0000000000eb8173 swift::TypeChecker::addImplicitConstructors(swift::NominalTypeDecl*) + 3187
18 swift           0x0000000000eb1ef6 swift::TypeChecker::typeCheckDecl(swift::Decl*, bool) + 150
21 swift           0x0000000000f182ea swift::TypeChecker::typeCheckFunctionBodyUntil(swift::FuncDecl*, swift::SourceLoc) + 346
22 swift           0x0000000000f1814e swift::TypeChecker::typeCheckAbstractFunctionBodyUntil(swift::AbstractFunctionDecl*, swift::SourceLoc) + 46
23 swift           0x0000000000f18d13 swift::TypeChecker::typeCheckAbstractFunctionBody(swift::AbstractFunctionDecl*) + 179
25 swift           0x0000000000ed4201 swift::performTypeChecking(swift::SourceFile&, swift::TopLevelContext&, swift::OptionSet<swift::TypeCheckingFlags, unsigned int>, unsigned int, unsigned int) + 1281
26 swift           0x0000000000c61489 swift::CompilerInstance::performSema() + 3289
28 swift           0x00000000007d82c9 swift::performFrontend(llvm::ArrayRef<char const*>, char const*, void*, swift::FrontendObserver*) + 2857
29 swift           0x00000000007a4308 main + 2872
Stack dump:
0.	Program arguments: /path/to/swift/bin/swift -frontend -c -primary-file validation-test/compiler_crashers/28344-swift-type-transform.swift -target x86_64-unknown-linux-gnu -disable-objc-interop -module-name main -o /tmp/28344-swift-type-transform-510b91.o
1.	While type-checking 'a' at validation-test/compiler_crashers/28344-swift-type-transform.swift:10:1
2.	While type-checking 'A' at validation-test/compiler_crashers/28344-swift-type-transform.swift:10:8
<unknown>:0: error: unable to execute command: Aborted
<unknown>:0: error: compile command failed due to signal (use -v to see invocation)
```

Author: practicalswift

validation-test/compiler_crashers/28344-swift-type-transform.swift

@@ -0,0 +1,10 @@
+// This source file is part of the Swift.org open source project
+// Copyright (c) 2014 - 2016 Apple Inc. and the Swift project authors
+// Licensed under Apache License v2.0 with Runtime Library Exception
+//
+// See http://swift.org/LICENSE.txt for license information
+// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
+
+// RUN: not --crash %target-swift-frontend %s -parse
+// REQUIRES: asserts
+func a{protocol A{class b<T=class d:A.b