87d02e0dfd
This reverts commit37eb9d13f8. Test failures have been fixed: - ubsan failure fixed by72eac42f21- warn-unsafe-buffer-usage-fixits-local-var-span.cpp fixed by03cc52dfd1(wasn't related) - test-output-format.ll failure was spurious, build failed at https://lab.llvm.org/buildbot/#/builders/54/builds/3545 (b4431b2d94) but passed at https://lab.llvm.org/buildbot/#/builders/54/builds/3546 (5ae99be037) which is before my revertb4431b2d94...5ae99be037Original commit message: Depends on https://reviews.llvm.org/D142861. Alternative to https://reviews.llvm.org/D137601. xxHash is much faster than djbHash. This makes a simple Rust test case with a large constant string 10% faster to compile. Previous attempts at changing this hash function (e.g. https://reviews.llvm.org/D97396) had to be reverted due to breaking tests that depended on iteration order. No additional tests fail with this patch compared to `main` when running `check-all` with `-DLLVM_ENABLE_PROJECTS="all"` (on a Linux host), so I hope I found everything that needs to be changed. Differential Revision: https://reviews.llvm.org/D142862
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