[InstCombine] Cast to BinaryOperator earlier in foldSelectIntoOp to simplify the code.

We no longer need the explicit operand count check or the later dynamic cast.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@310339 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed