Stuart Cook
4e3e7ce078
specialize slice::fill to use memset when possible It helps const eval performance https://github.com/rust-lang/miri/issues/4616, debug builds and the gcc backend. Previously attempted in https://github.com/rust-lang/rust/pull/83245 but reverted due to unsoundness https://github.com/rust-lang/rust/issues/87891 around potentially-uninitialized types. This PR only handles primitives where the problem does not arise. split off from https://github.com/rust-lang/rust/pull/147294
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