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Resubmit "[CorrelatedValuePropagation] Fix prof branch_weights metadata…

Authored by yrouban on Jun 4 2019, 10:46 PM.

Description

Resubmit "[CorrelatedValuePropagation] Fix prof branch_weights metadata handling for SwitchInst"

This reverts commit 5b32f60ec31ce136edac6f693538aeb6039f4ad0.
The fix is in commit 4f9e68148bd0dada2d6997625432385918ac2e2c.

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: 362583