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Before r268509, Clang would disable the loop unroll pass when optimizing for size. That commit enabled it to be able to support unroll pragmas in -Os builds. However, this regressed binary size in one of Chromium's DLLs with ~100 KB. This restores the original behaviour of no unrolling at -Os, but doing it in LLVM instead of Clang makes more sense, and also allows the pragmas to keep working. Differential revision: http://reviews.llvm.org/D20115 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@269124 91177308-0d34-0410-b5e6-96231b3b80d8
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