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Summary: Also added a reserve() method to MapVector since we want to use that from ADCE. DenseMap does not provide deterministic iteration order so with that we will handle the members of BlockInfo in random order, eventually leading to random order of the blocks in the predecessor lists. Without this change, I get the same predecessor order in about 90% of the time when I compile a certain reproducer and in 10% I get a different one. No idea how to make a proper test case for this. Reviewers: kuhar, david2050 Reviewed By: kuhar Subscribers: llvm-commits Differential Revision: https://reviews.llvm.org/D39593 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@317323 91177308-0d34-0410-b5e6-96231b3b80d8