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If several regions cover the same area of code, we have to restore the combined value for that area when return from a nested region. This patch achieves that by combining regions before calling buildSegments. Differential Revision: http://reviews.llvm.org/D18610 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@267390 91177308-0d34-0410-b5e6-96231b3b80d8