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Add support for Arm64EC inline assembly (as unstable) Compiler support for Arm64EC assembly mostly reuses the existing AArch64 support, except that it needs to block registers that are not permitted: <https://learn.microsoft.com/en-us/windows/arm/arm64ec-abi#register-mapping-and-blocked-registers> For assembly authors there are several caveats and differences that need to be considered, I've provided documentation for this as part of the "Standard Library Support" PR: <https://github.com/rust-lang/rust/pull/123144/files#diff-6b08532480943c8b82f5dbda7ee1521afa74c9f626466aeb308dfa6956397edd> r? rust-lang/compiler