[Sema] Simplify a couple if statements. Explicitly check up front that only one of the expressions is a comparision op. Then if we find that either is a bitwise op, we know it must be the other one. NFC
[Sema] Simplify a couple if statements. Explicitly check up front that only one of the expressions is a comparision op. Then if we find that either is a bitwise op, we know it must be the other one. NFC

git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@255427 91177308-0d34-0410-b5e6-96231b3b80d8

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