47aaa99c0e
This is an enhancement motivated by https://llvm.org/PR16739 (see D92858 for another). We can look through a GEP to find a base pointer that may be safe to use for a vector load. If so, then we shuffle (shift) the necessary vector element over to index 0. Alive2 proof based on 1 of the regression tests: https://alive2.llvm.org/ce/z/yPJLkh The vector translation is independent of endian (verify by changing to leading 'E' in the datalayout string). Differential Revision: https://reviews.llvm.org/D93229