llvm-project

9ffd2e40 - [SimplifyCFG] Fix `SimplifyCFG` pass to skip folding when both blocks contain convergence loop/entry intrinsics. (#166452)

[SimplifyCFG] Fix `SimplifyCFG` pass to skip folding when both blocks contain convergence loop/entry intrinsics. (#166452) Fixes a bug https://github.com/llvm/llvm-project/issues/165642. [Similar fix](https://github.com/llvm/llvm-project/pull/165643) is being made in `IndVarSimplify` pass to account for convergence tokens. [LLVM Spec](https://llvm.org/docs/ConvergentOperations.html#llvm-experimental-convergence-loop) states that only a single loop / entry convergence token can be included in a basic block. This PR fixes the issue in `SimplifyCFG` pass so that when a basic block and its predecessor both contain such convergence intrinsics, it skips merging the two blocks.