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Enable the X86 call frame optimization for the 64-bit targets that allow it.

Authored by DavidKreitzer on May 2 2016, 6:45 AM.

Description

Enable the X86 call frame optimization for the 64-bit targets that allow it. Fixes PR27241.

Differential Revision: http://reviews.llvm.org/D19688

llvm-svn: 268227