[PATCH] Disable statistics on Release builds and move tests that depend on -stats.

[Jan Voung]

Statistics are still available in Release+Asserts (or any +Asserts builds),
and they can also be turned on with LLVM_ENABLE_STATS.

Also change some of the FastISel stats that were moved under DEBUG()
back out of DEBUG(), since stats are disabled across the board now.

Many tests depend on grepping "-stats" output.  Move those into
a orig_dir/Stats/. so that they can be marked as unsupported
when building without statistics.

http://llvm-reviews.chandlerc.com/D486
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