[PATCH] [X86] Use single add/sub for large stack offsets

[Robert Lougher]

I have uploaded a new diff which hopefully addresses the inreg attribute issue.  I have also updated the tests to include a test for it.


http://reviews.llvm.org/D7226

Files:
  lib/Target/X86/X86FrameLowering.cpp
  test/CodeGen/X86/huge-stack-offset.ll

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