[PATCH] [CodeGen] prevent abort on invalid attributes

[Saleem Abdulrasool]

Hi dblaikie,

Currently, when an invalid attribute is encountered on processing a .s file, clang will abort() due to an assertion.  Invalid user input should not cause an abnormal termination of the compiler.  This is a merely a first step at attempting to improve handling of malformed user input to clang.

http://llvm-reviews.chandlerc.com/D1293

Files:
  include/llvm/MC/MCELFStreamer.h
  include/llvm/MC/MCStreamer.h
  lib/MC/MCAsmStreamer.cpp
  lib/MC/MCELFStreamer.cpp
  lib/MC/MCMachOStreamer.cpp
  lib/MC/MCNullStreamer.cpp
  lib/MC/MCParser/AsmParser.cpp
  lib/MC/MCPureStreamer.cpp
  lib/MC/WinCOFFStreamer.cpp
  tools/lto/LTOModule.cpp
  test/CodeGen/2013-08-01-invalid-attributes.s
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