specialize slice::fill to use memset when possible #147457
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LLVM generally can do this on its own, but it helps miri and other backends.
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It helps const eval performance rust-lang/miri#4616, debug builds and the gcc backend.
Previously attempted in #83245 but reverted due to unsoundness #87891 around potentially-uninitialized types. This PR only handles primitives where the problem does not arise.
split off from #147294