[PATCH] Report fatal errors instead of segfaulting/asserting on a few invalid accesses while reading MachO files.

[Filipe Cabecinhas]

Rephrase error pointed out by majnemer
Added a test requested by Rafael

Rafael: Extracting that part of the function yields code that's a bit too convoluted. Check which version you prefer (or suggest other changes).


http://reviews.llvm.org/D6945

Files:
  lib/Object/MachOObjectFile.cpp
  test/Object/Inputs/macho-invalid-bad-symbol-index
  test/Object/Inputs/macho-invalid-no-size-for-sections
  test/Object/Inputs/macho-invalid-section-index
  test/Object/Inputs/macho-invalid-symbol-name-past-eof
  test/Object/Inputs/macho-invalid-too-small-load-command
  test/Object/Inputs/macho-invalid-zero-ncmds
  test/Object/Inputs/macho-zero-ncmds
  test/Object/Inputs/macho64-invalid-getsection-index
  test/Object/Inputs/macho64-invalid-incomplete-load-command
  test/Object/Inputs/macho64-invalid-no-size-for-sections
  test/Object/Inputs/macho64-invalid-too-small-load-command
  test/Object/macho-invalid.test
  test/Object/objdump-macho-quirks.test

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