[PATCH] D20703: [SCEV] Keep SCEVExpander insert points consistent.

[Geoff Berry via llvm-commits]

gberry created this revision.
gberry added a reviewer: sanjoy.
gberry added subscribers: llvm-commits, qcolombet, mzolotukhin.
Herald added subscribers: mcrosier, sanjoy.

Make sure that the SCEVExpander Builder insert point and any
saved/restored insert points are kept consistent (i.e. their Instruction
and BasicBlock match) when moving instructions in SCEVExpander.

This fixes an issue triggered by
http://reviews.llvm.org/D18001 [LSR] Create fewer redundant instructions.

http://reviews.llvm.org/D20703

Files:
  include/llvm/Analysis/ScalarEvolutionExpander.h
  include/llvm/IR/IRBuilder.h
  lib/Analysis/ScalarEvolutionExpander.cpp

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