Teach ValueTracking to look at the dividend when determining the sign bit of an srem instruction.
Teach ValueTracking to look at the dividend when determining the sign bit of an
srem instruction.


git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@126637 91177308-0d34-0410-b5e6-96231b3b80d8

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