[PATCH] Enable ExitValue rewrite only when expansion cost is low.

[hfinkel at anl.gov]

Does this only apply when the loop otherwise has side effects? If the loop can be removed once the exit value is unused, maybe we should do it anyway?


REPOSITORY
  rL LLVM

================
Comment at: lib/Transforms/Scalar/IndVarSimplify.cpp:616
@@ +615,3 @@
+        if (ReplaceExitValue == OnlyCheapRepl &&
+            Rewriter.isHighCostExpansion(ExitValue, L)) {
+          continue;
----------------
No { } needed here.

http://reviews.llvm.org/D9800

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