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

This reverts commit 5b32f60e.
The fix is in commit 4f9e6814.

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