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Author SHA1 Message Date
Florian Hahn 57ae9bb932 [LSR] Preserve MSSA when using SplitCriticalEdge. 
LSR claims to MemorySSA, but we also have to make sure it is preserved
when splitting critical edges. This can be done by passing MSSAU to
SplitCriticalEdge.

Fixes PR47557.
 2020-09-21 09:51:26 +01:00