[PATCH] [NVPTX] Do not emit .weak symbols for NVPTX

[Jingyue Wu]

Hi jholewinski,

".weak" symbols cannot be consumed by ptxas (PR21685). This patch makes the
weak directive in MCAsmPrinter customizable, and disables emitting ".weak"
symbols for NVPTX.

http://reviews.llvm.org/D6455

Files:
  include/llvm/MC/MCAsmInfo.h
  lib/MC/MCAsmInfo.cpp
  lib/MC/MCAsmStreamer.cpp
  lib/Target/NVPTX/MCTargetDesc/NVPTXMCAsmInfo.cpp
  test/CodeGen/NVPTX/weak-linkage.ll
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