De-duplicate the two implementations of ARMBaseInstrInfo::isProfitableToIfCvt() [NFC]
De-duplicate the two implementations of ARMBaseInstrInfo::isProfitableToIfCvt() [NFC]

Reviewers: congh, rengolin

Subscribers: aemerson, llvm-commits

Differential Revision: https://reviews.llvm.org/D30934

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@297738 91177308-0d34-0410-b5e6-96231b3b80d8

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