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x64: Lower SIMD requirement to SSE2 #6625

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Commits on Jun 22, 2023

  1. x64: Lower SIMD requirement to SSE2

    All instructions in Cranelift now have lowerings for SSE2 as a baseline,
    even if they're not exactly the speediest things in the world. This
    enables lowering the baseline required for the SIMD proposal for
    WebAssembly to SSE2, the base features set of x86_64. Lots of tests were
    updated here to remove explicit `has_foo=false` annotations as they no
    longer have any effect.
    
    Additionally fuzzing has been updated to enable disabling `sse3` and
    `ssse3` which will help stress-test all previously-added lowerings.
    alexcrichton committed Jun 22, 2023
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