[PATCH] Fix Itanium ABI for ARM

[Weiming Zhao]

Hi rafael,

r218141 "In the Itanium ABI, move stuff to the comdat of variables with static init." causes gnu as crash for ARM in some cases:

foo.s: Assembler messages:
foo.s:208: Internal error!
Assertion failure in get_line_subseg at crosstool_linaro/src/crosstool-ng-linaro-1.13.1-4.8-2014.01/builds/arm-linux-gnueabi-linux/.build/src/binutils-linaro-2.24-2013.12/gas/dwarf2dbg.c line 271.

r218141 handles the comdat of varialbes for Itanium ABI. However, the routine is shared by both ARM and Itanium. 
It seems the change should be guarded to Itanium only.

http://reviews.llvm.org/D6366

Files:
  lib/CodeGen/ItaniumCXXABI.cpp
  test/CodeGenCXX/static-data-member.cpp
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