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Using profile information to guide consthoisting is generally helpful for performance, so the patch turns it on by default. No compile time or perf regression were found using spec2000 and spec2006 on x86. Some significant improvement (>20%) was seen on internal benchmarks. Differential Revision: https://reviews.llvm.org/D35063 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@307338 91177308-0d34-0410-b5e6-96231b3b80d8