Add kill flag verification.
Add kill flag verification.

At least X86FloatingPoint requires correct kill flags after register allocation,
and targets using register scavenging benefit. Conservative kill flags are not
enough.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@117960 91177308-0d34-0410-b5e6-96231b3b80d8

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