[PATCH] llvm-mc & llc tools hang if no input arguments are present

[Jyoti Allur]

Hi rafael, echristo,

Hello,

llvm-mc & llc tools hang if no input arguments are present, until ctrlC is used to get the command prompt back.
New developers many not know about these tool's usage. Hence the fix.

http://reviews.llvm.org/D5727

Files:
  llvm/tools/llc/llc.cpp
  llvm/tools/llvm-mc/llvm-mc.cpp
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