[PATCH][RFC] Add PRFCHW support

[Michael Liao]

Hi All

AVX2 adds PREFETCHW insn (the same insn in 3DNow! as well). The attached
two patches add its support in LLVM/clang.

'0001-Add-PREFETCHW-codegen-support.patch' adds DAG pattern to help
generate PREFETCHW from LLVM prefetch intrinsic when either PRFCHW or
3DNOW is available.

'0001-Add-PRFCHW-support.patch' adds '-mprfchw' option, '__PRFCHW__'
predefined macro, and prfchwintrin.h header which is included when
either 3DNow! or PRFCHW is available.

Thanks for review
- Michael

--
[1] http://software.intel.com/sites/default/files/319433-014.pdf
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