[PATCH] D22696: [CodeGenPrep] Skip merging empty case blocks

[David Li via llvm-commits]

davidxl added a comment.

We actually see similar issues introduced by SimplifyCFG which introduces new critical edges which later can not be properly split in PhiElimination which results in copy instructions be inserted into blocks with higher frequency.  Until we have a better solution, this patch seems like a reasonable workaround.

Hal, what is your opinion?


https://reviews.llvm.org/D22696