[PATCH] Fix invalid memory access in llvm-mc if file ends in non-newline whitespace or comma

[colinl at codeaurora.org]

Str may be empty after .find_first_not_of(" \t\r,") and the following Str[0] accesses invalid memory.

http://reviews.llvm.org/D6151

Files:
  test/tools/llvm-mc/line_end_with_space.test
  tools/llvm-mc/Disassembler.cpp
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