[PATCH] Allow target to specify prefix for labels

[Matt Arsenault]

Hi rafael,

Use the MCAsmInfo instead of the DataLayout, and allow
specifying a custom prefix for labels specifically. HSAIL
requires that labels begin with @, but global symbols with &.

http://reviews.llvm.org/D6467

Files:
  include/llvm/MC/MCAsmInfo.h
  lib/CodeGen/MachineBasicBlock.cpp
  lib/MC/MCAsmInfo.cpp
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