[PATCH] Use function attribute "trap-func-name" and remove TargetOptions::TrapFuncName

[Akira Hatanaka]

Hi echristo, dexonsmith,

This patch changes normal isel and fast-isel to read the user-defined trap function name from function attribute "trap-func-name" instead of from TargetOptions::TrapFuncName.

This is the llvm side change that goes with this clang patch:
http://reviews.llvm.org/D10831

http://reviews.llvm.org/D10832

Files:
  include/llvm/CodeGen/CommandFlags.h
  include/llvm/Target/TargetOptions.h
  lib/CodeGen/SelectionDAG/FastISel.cpp
  lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
  lib/CodeGen/TargetOptionsImpl.cpp
  test/CodeGen/ARM/fnattr-trap.ll

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