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Specify branch probabilities for callbr dests
Summary: callbr's indirect branches aren't expected to be taken, so reduce their probabilities to 0 while increasing the default destination to 1. This allows some code improvements through block placement. Reviewers: nickdesaulniers Subscribers: hiraditya, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D72656
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