[X86] Make hasNoCarryFlagUses/hasNoSignedComparisonUses take an SDValue that indicate...

[X86] Make hasNoCarryFlagUses/hasNoSignedComparisonUses take an SDValue that indicates which result is the flag result. NFCI

hasNoCarryFlagUses hardcoded that the flag result is 1 and used that to filter which uses were of interest. hasNoSignedComparisonUses just assumes the only result is flags and checks whether any user of the node is a CopyToReg instruction.

After this patch we now do a result number check in both and rely on the caller to provide the result number.

This shouldn't change behavior it was just an odd difference between the two functions that I noticed.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@349222 91177308-0d34-0410-b5e6-96231b3b80d8