[PATCH] Change loop unroll and vectorizer metadata prefix to 'llvm.loop.'

[Mark Heffernan]

These patches rename the loop unrolling and loop vectorizer metadata
such that they have a common 'llvm.loop.' prefix.  Metadata name
changes:

llvm.vectorizer.* => llvm.loop.vectorizer.*
llvm.loopunroll.* => llvm.loop.unroll.*

This was a suggestion from an earlier review
(http://reviews.llvm.org/D4090) which added the loop unrolling
metadata.  Two patches are attached.  One for front-end and one for
optimizer.

Mark
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