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

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

Move 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.

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

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@176733 91177308-0d34-0410-b5e6-96231b3b80d8

test/Analysis/RegionInfo/nested_loops.ll

@@ -1,33 +0,0 @@
-; RUN: opt -regions -analyze < %s | FileCheck %s
-; RUN: opt -regions -stats < %s 2>&1 | FileCheck -check-prefix=STAT %s
-
-; RUN: opt -regions -print-region-style=bb  -analyze < %s 2>&1 | FileCheck -check-prefix=BBIT %s
-; RUN: opt -regions -print-region-style=rn  -analyze < %s 2>&1 | FileCheck -check-prefix=RNIT %s
-
-define internal fastcc zeroext i8 @handle_compress() nounwind {
-entry:
-  br label %outer
-
-outer:
-  br label %body
-
-body:
-  br i1 1, label %exit172, label %end
-
-exit172:
-  br i1 1, label %end, label %outer
-
-end:
-  ret i8 1
-}
-; CHECK-NOT: =>
-; CHECK: [0] entry => <Function Return>
-; CHECK-NEXT: [1] outer => end
-
-; STAT: 2 region - The # of regions
-
-; BBIT: entry, outer, body, exit172, end,
-; BBIT: outer, body, exit172,
-
-; RNIT: entry, outer => end, end,
-; RNIT: outer, body, exit172,