[PATCH] Change MCRegisterInfo::getLLVMRegNum() not to assert on unknown register.

[Frederic Riss]

Keep the current asserting behavior in getLLVMRegNum() but
implement it in terms of a new non-asserting tryGetLLVMRegNum().

http://reviews.llvm.org/D6243

Files:
  include/llvm/MC/MCRegisterInfo.h
  lib/MC/MCRegisterInfo.cpp
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