[CorrelatedValuePropagation] Fix prof branch_weights metadata handling for SwitchInst
This patch fixes the CorrelatedValuePropagation pass to keep prof branch_weights metadata of SwitchInst consistent. It makes use of SwitchInstProfUpdateWrapper. New tests are added. Reviewed By: nikic Differential Revision: https://reviews.llvm.org/D62126 llvm-svn: 361808
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