Nathan Hawes 17a6ef5c6e Clear any LLVMArgs when initializing the CompilerInvocation for SourceKit's ASTManager ...

SourceKit doesn't use them and if any unrecognised LLVM options are
passed to llvm::cl::ParseCommandLineOptions() it calls exit(), bringing
down SourceKit.

Also use fprintf instead of llvm::errs() in Logging.cpp as it uses a
global C++ object that had already been destructed when logging the
above failure.

Resolves rdar://problem/38314383

2018-03-09 18:56:57 -08:00

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