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This revision adds support for canonicalizing the following: ``` cond_br %cond, ^bb1(A, ..., N), ^bb1(A, ..., N) br ^bb1(A, ..., N) ``` If the operands to the successor are different and the cond_br is the only predecessor, we emit selects for the branch operands. ``` cond_br %cond, ^bb1(A), ^bb1(B) %select = select %cond, A, B br ^bb1(%select) ``` Differential Revision: https://reviews.llvm.org/D78682