Avoid editing the current live interval during remat.
Avoid editing the current live interval during remat.

The live interval may be used for a spill slot as well, and that spill slot
could be shared by split registers. We cannot shrink it, even if we know the
current register won't need the spill slot in that range.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@110721 91177308-0d34-0410-b5e6-96231b3b80d8

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