[PATCH] Avoid crash reading bitcode files with bad abbrev record (bug 20485)

[David Callahan]

Hi rafael,

Modified bit code reader to return failure when an invalid abbrev record
is found. ReadAbbrevRecord modified to return "true" in this case and false on success.
Clients modified to check this return value.

REPOSITORY
  rL LLVM

http://reviews.llvm.org/D7003

Files:
  include/llvm/Bitcode/BitCodes.h
  include/llvm/Bitcode/BitstreamReader.h
  lib/Bitcode/Reader/BitstreamReader.cpp
  test/Bitcode/bad-abbrev-record.txt
  test/Bitcode/bad-abbrev-record.txt.bc
  test/Bitcode/bad-abbrev-record.txt.stderr
  test/ExecutionEngine/MCJIT/eh-lg-pic.ll
  test/ExecutionEngine/MCJIT/eh-sm-pic.ll
  test/ExecutionEngine/MCJIT/eh.ll
  test/ExecutionEngine/MCJIT/multi-module-eh-a.ll
  tools/llvm-bcanalyzer/llvm-bcanalyzer.cpp

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