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f611ae40fd
When simplifycfg moves an instruction, it must drop metadata it doesn't know is still valid with the preconditions changes. In particular, it must drop the range and tbaa metadata. The patch implements this with an utility function to drop all metadata not in a white list. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200322 91177308-0d34-0410-b5e6-96231b3b80d8
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