Reapply "[LowerMemIntrinsics] Use correct alignment in residual loop for variable llvm.memcpy" (#98482) Reverts llvm/llvm-project#98295, which reverted llvm/llvm-project#97998 The failure in the "InOneWeekend" test of the HIP test suite on clang-hip-vega20 (https://lab.llvm.org/buildbot/#/builders/123/builds/1498) seems to be unrelated; I observed it (and a similar failure for the "TheNextWeek" test in the same suite) intermittently on my system, with and without the patch applied. (It occurred in 2 out of 50 repeated runs without the patch and in 1 out of 50 runs with the patch.)
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