Extend native A64 startup instruction execution - #9
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Extend native A64 startup instruction execution
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Extend native A64 startup execution with independently authored instruction contracts and provider tests: UBFM, extended arithmetic, conditional selection, scalar register-offset loads/stores, TBZ/TBNZ, ordinary MADD/MSUB and destination-preserving BFM/BFI/BFXIL/BFC. Correct reference W compare width and exact register-branch validation. Keep unsupported neighboring encodings explicit.
The BFM increment checks all legal width/immediate combinations with an independent bit-origin oracle, register aliases, ZR, W zero-extension, destination preservation, unchanged flags and malformed encodings. Direct/native/reference and provider checks, compiled mutation controls and the UEFI target build pass. Parent integration also executes an authored EFI consumer and the unchanged six-case captured-Arm comparator against an immutable archived source freeze.
These changes improve bounded pre-OS execution; they do not establish complete architecture support, normal macOS startup or physical desktop output. See parent PR 26x86/26x86#19 for the actual integration boundary and source-bound evidence.