tree b33b02b1f99f19096bfa2f5318883a15af6df221
parent 8013d477aeac6b596216b0c68134d11561f8b05f
author Jaebaek Seo <jaebaek@google.com> 1579030521 -0500
committer GitHub <noreply@github.com> 1579030521 -0500
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Fix OpLine bug of merge-blocks pass (#3130)

As explained in #3118, spirv-opt merge-blocks pass causes a
spirv-val error when an OpBranch has an OpLine in front of it.

OpLoopMerge
OpBranch ; Will be killed by merge-blocks pass
OpLabel  ; Will be killed by merge-blocks pass
OpLine   ; will be placed between OpLoopMerge and OpBranch - error!
OpBranch

To fix this issue, this commit moves line info of OpBranch to
OpLoopMerge.

Fixes #3118