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Mehdi Amini 8d5a981a13 Revert "[SimplifyCFG] Update FoldBranchToCommonDest to be poison-safe"

This reverts commit 99108c791de0285ee726a10e8274772b18cee73c.
Clang is miscompiling LLVM with this change, a stage-2 build hits
multiple failures.

As a repro, I built clang in a stage1 directory and used it this way:

cmake -G Ninja ../llvm \
  -DCMAKE_CXX_COMPILER=`pwd`/../build-stage1/bin/clang++ \
  -DCMAKE_C_COMPILER=`pwd`/../build-stage1/bin/clang \
  -DLLVM_TARGETS_TO_BUILD="X86;NVPTX;AMDGPU" \
  -DLLVM_ENABLE_PROJECTS=mlir \
  -DLLVM_BUILD_EXAMPLES=ON \
  -DCMAKE_BUILD_TYPE=Release \
  -DLLVM_ENABLE_ASSERTIONS=On
ninja check-mlir

2021-03-08 00:15:47 +00:00

branch-fold-threshold.ll

Revert "[SimplifyCFG] Update FoldBranchToCommonDest to be poison-safe"

2021-03-08 00:15:47 +00:00

cttz-ctlz.ll

[SimplifyCFG] TryToSimplifyUncondBranchFromEmptyBlock() already knows how to preserve DomTree

2020-12-17 01:03:49 +03:00

lit.local.cfg

…

phi-eliminate.ll

[SimplifyCFG] Teach FoldTwoEntryPHINode() to preserve DomTree

2020-12-20 00:18:33 +03:00