Dan Gohman 899cb5ab7b [WebAssembly] Fix unbalanced register stack code in the case of late DCE. ...

Instructions can be DCE'd after the RegStackify pass. If the instruction which
would be the pop for what would be a push is removed, don't use a push.

llvm-svn: 258694

2016-01-25 16:48:44 +00:00

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