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Author SHA1 Message Date
Max Kazantsev 360ab70712 [SimplifyCFG] Do not create unneeded PR Phi in block with convergent calls 
We do not thread blocks with convergent calls, but this check was missing
when we decide to insert PR Phis into it (which we only do for threading).

Differential Revision: https://reviews.llvm.org/D83936
Reviewed By: nikic
 2020-07-22 13:53:50 +07:00
Max Kazantsev 989ee11df6 [Test] Add test that shows how SimplifyCFG may insert redunant Phi 
It happens when a block cannot be threaded because of a convergent function.
 2020-07-16 16:23:11 +07:00