[PATCH] Attach attribute "trap-func-name" to IR function

[Akira Hatanaka]

Hi echristo, dexonsmith,

This patch is part of the work to make LTO and function multi-versioning work correctly.

Currently, the trap function name users specify on the command line using -ftrap-function is passed to the backend via TargetMachine's TargetOptions. This patch attaches attribute "trap-func-name" to the IR function instead so that we can use -ftrap-function for LTO builds and change the trap function name on a per-function basis.

http://reviews.llvm.org/D10831

Files:
  include/clang/Driver/CC1Options.td
  include/clang/Frontend/CodeGenOptions.h
  lib/CodeGen/BackendUtil.cpp
  lib/CodeGen/CGCall.cpp
  lib/Driver/Tools.cpp
  lib/Frontend/CompilerInvocation.cpp
  test/CodeGen/fn-attr.c

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