Duncan P. N. Exon Smith ec083b59ed ARM: Avoid dereferencing end() in ARMFrameLowering::emitPrologue ...

llvm::tryFoldSPUpdateIntoPushPop assumes its arguments are valid
MachineInstrs.  Update ARMFrameLowering::emitPrologue to respect that;
when LastPush==end(), it can't possibly be a push instruction anyway.

llvm-svn: 278880

2016-08-17 00:53:04 +00:00

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