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When we vectorize a scalar constant, the vector constant is inserted before its first user if the scalar constant is defined outside the loops to be vectorized. It is possible that the vector constant does not dominate all its users. To fix the problem, we find the innermost vectorized loop that encloses that first user and insert the vector constant at the top of the loop body. Reviewed By: nicolasvasilache Differential Revision: https://reviews.llvm.org/D106609