d69fc653c1
If `promoteAllocaUserToVector` returns the placeholder, it means the instruction does not actually modify the alloca. we don't need to add the placeholder as block available value for correctness. Instructions appear afterwards in the the same block could still get the placeholder as source value through GetCurVal() call. Instructions in other block which access the alloca will be set up later when we really do placeholder replacement. This help simplify the placeholder replacement logic.
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