[PATCH] Use function attribute "arm-restrict-it"

[Akira Hatanaka]

Following the discussion on cfe-commits (http://lists.cs.uiuc.edu/pipermail/cfe-commits/Week-of-Mon-20150622/thread.html#131397), I've made changes to define a new ARM subtarget feature and use it to determine if IT blocks should be restricted. Previously, ARMSubtarget would check if the target supports armv8 instructions to make this decision. This is no longer needed as that decision is made in the front-end (see the corresponding clang patch:  http://reviews.llvm.org/D10414).


http://reviews.llvm.org/D10416

Files:
  lib/Target/ARM/ARM.td
  lib/Target/ARM/ARMSubtarget.cpp
  test/CodeGen/ARM/2013-05-05-IfConvertBug.ll
  test/CodeGen/ARM/2014-08-04-muls-it.ll
  test/CodeGen/ARM/arm-and-tst-peephole.ll
  test/CodeGen/ARM/ifcvt-branch-weight.ll
  test/CodeGen/ARM/thumb2-it-block.ll
  test/CodeGen/Thumb2/restict-it-fnattr.ll
  test/CodeGen/Thumb2/thumb2-ifcvt1.ll
  test/CodeGen/Thumb2/thumb2-ifcvt2.ll
  test/CodeGen/Thumb2/thumb2-ifcvt3.ll
  test/CodeGen/Thumb2/v8_IT_1.ll
  test/CodeGen/Thumb2/v8_IT_2.ll
  test/CodeGen/Thumb2/v8_IT_3.ll
  test/CodeGen/Thumb2/v8_IT_4.ll
  test/CodeGen/Thumb2/v8_IT_5.ll

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