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Commit 84fd4bee authored by Matthias Braun's avatar Matthias Braun
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RegScavenging: Add scavengeRegisterBackwards() 

This is a variant of scavengeRegister() that works for
enterBasicBlockEnd()/backward(). The benefit of the backward mode is
that it is not affected by incomplete kill flags.

This patch also changes
PrologEpilogInserter::doScavengeFrameVirtualRegs() to use the register
scavenger in backwards mode.

Differential Revision: http://reviews.llvm.org/D21885

llvm-svn: 276044
parent 4cb68e10
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