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/Transforms/LoopUnswitch/infinite-loop.ll

@@ -1,57 +0,0 @@
-; RUN: opt -loop-unswitch -disable-output -stats -info-output-file - < %s | FileCheck --check-prefix=STATS %s
-; RUN: opt -loop-unswitch -simplifycfg -S < %s | FileCheck %s
-; PR5373
-
-; Loop unswitching shouldn't trivially unswitch the true case of condition %a
-; in the code here because it leads to an infinite loop. While this doesn't
-; contain any instructions with side effects, it's still a kind of side effect.
-; It can trivially unswitch on the false cas of condition %a though.
-
-; STATS: 2 loop-unswitch - Number of branches unswitched
-; STATS: 1 loop-unswitch - Number of unswitches that are trivial
-
-; CHECK: @func_16
-; CHECK-NEXT: entry:
-; CHECK-NEXT: br i1 %a, label %entry.split, label %abort0.split
-
-; CHECK: entry.split:
-; CHECK-NEXT: br i1 %b, label %cond.end.us, label %abort1
-
-; CHECK: cond.end.us:
-; CHECK-NEXT: br label %cond.end.us
-
-; CHECK: abort0.split:
-; CHECK-NEXT: call void @end0() [[NOR_NUW:#[0-9]+]]
-; CHECK-NEXT: unreachable
-
-; CHECK: abort1:
-; CHECK-NEXT: call void @end1() [[NOR_NUW]]
-; CHECK-NEXT: unreachable
-
-; CHECK: }
-
-define void @func_16(i1 %a, i1 %b) nounwind {
-entry:
-  br label %for.body
-
-for.body:
-  br i1 %a, label %cond.end, label %abort0
-
-cond.end:
-  br i1 %b, label %for.body, label %abort1
-
-abort0:
-  call void @end0() noreturn nounwind
-  unreachable
-
-abort1:
-  call void @end1() noreturn nounwind
-  unreachable
-}
-
-declare void @end0() noreturn
-declare void @end1() noreturn
-
-; CHECK: attributes #0 = { nounwind }
-; CHECK: attributes #1 = { noreturn }
-; CHECK: attributes [[NOR_NUW]] = { noreturn nounwind }