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06d3099445
This reapplies revision 285093. Original commit message: The branch folding pass tail merges blocks into a common-tail. However, the tail retains the debug information from one of the original inputs to the merge (chosen randomly). This is a problem for sampled-based PGO, as hits on the common-tail will be attributed to whichever block was chosen, irrespective of which path was actually taken to the common-tail. This patch fixes the issue by nulling the debug location for the common-tail. Differential Revision: https://reviews.llvm.org/D25742 llvm-svn: 285212