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Jonathan Brouwer
9545845017
compiletest: Simplify `//@ needs-asm-mnemonic: ret` to just `//@ needs-asm-ret` - Simplification of https://github.com/rust-lang/rust/pull/155692. --- The `needs-asm-mnemonic` directive was very general, but in practice was only being used for `ret`. There are very few other mnemonics that it could plausibly be useful for (e.g. `nop`), because any instruction that requires arguments is probably going to be non-portable. This PR replaces `needs-asm-mnemonic` with a simpler `needs-asm-ret` directive that uses the same machinery as other simple needs directives. If we happend to need more mnemonics in the future, we can just add more simple directives as appropriate (e.g. `needs-asm-nop`).