[PATCH] Add loop unrolling metadata descriptions to LangRef.rst

[Mark Heffernan]

Hi hfinkel,

This patch adds descriptions of the loop unrolling metadata optimization hints ("llvm.loop.unroll.*") to LangRefs.rst.  The change also tweaks the language for the vectorization optimization hints to be consistent with the unrolling ones and the language in tools/clang/docs/LanguageExtension.rst.

http://reviews.llvm.org/D4576

Files:
  docs/LangRef.rst
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