[llvm] r178845 - Fix bug in PEI's virtual-register scavenging

[Krzysztof Parzyszek]

On 4/5/2013 12:01 AM, Hal Finkel wrote:
>
> Unfortunately,
> after this, the scavenger needs to iterate through the spill code and then
> visit, again, the instruction that defines the now-scavenged register.

Wouldn't it be easier to "tell" the scavenger that the scavenged 
register is now "used"?

-Krzysztof

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