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bbfe79fb72
Commit e1ce752a1d, "Cygwin: remove miscellaneous 32-bit code", removed most occurrences of '#ifdef __x86_64__'. Restore those occurrences that guarded code specific to the AMD64 processor, and #error out if the processor is different. This will make it easier to find AMD64-specific code if we ever want to add support for a different 64-bit processor (e.g., ARM64).