Do not merge if the BB is target of a merge instruction The block "should" not be a target of a merge instruction, as it it is a target of an OpBranch, but it seems to be possible to e.g. let a merge instruction point to a BB later than the actual control flow merge.
Do not merge if the BB is target of a merge instruction
The block "should" not be a target of a merge instruction, as it it is a
target of an OpBranch, but it seems to be possible to e.g. let a merge
instruction point to a BB later than the actual control flow merge.

kristerw/spirv-tools