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Rollup merge of #109179 - llogiq:intrinsically-option-as-slice, r=eholk

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move Option::as_slice to intrinsic

````@scottmcm```` suggested on #109095 I use a direct approach of unpacking the operation in MIR lowering, so here's the implementation.

cc ````@nikic```` as this should hopefully unblock #107224 (though perhaps other changes to the prior implementation, which I left for bootstrapping, are needed).
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Dylan DPC 2023-03-23 00:00:31 +05:30 • committed by GitHub
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compiler/rustc_hir/src/lang_items.rs
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@ -301,6 +301,7 @@ language_item_table! {
Context, sym::Context, context, Target::Struct, GenericRequirement::None;
FuturePoll, sym::poll, future_poll_fn, Target::Method(MethodKind::Trait { body: false }), GenericRequirement::None;
Option, sym::Option, option_type, Target::Enum, GenericRequirement::None;
OptionSome, sym::Some, option_some_variant, Target::Variant, GenericRequirement::None;
OptionNone, sym::None, option_none_variant, Target::Variant, GenericRequirement::None;