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[LoopSimplifyCFG] Invalidate SCEV in LoopSimplifyCFG

Authored by dmgreen on Jun 19 2018, 2:43 AM.

Description

[LoopSimplifyCFG] Invalidate SCEV in LoopSimplifyCFG

LoopSimplifyCFG, being a loop pass, needs to preserve scalar
evolution. This invalidates SE for the loops altered during
block merging.

Differential Revision: https://reviews.llvm.org/D48258

llvm-svn: 335036