[MachO] Recognize arm64e.x1 and other new Mach-O slice variants - #8572
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Fixes #8571.
Xcode 27's linker also knows about
.x2variants so I've added those while I'm here. Its CPU subtypes come fromld's output.The non-
evariants are included for symmetry.CPU_SUBTYPE_ARM64_X1is declared inmach/machine.h, andclang -cwill emitarm64.x1 objects.ldis not able to link an executable or dylib for either of them.