[6.1 cp] [Clang][Driver] Add arm64e support for Swift’s "-none-macho" target triples in Clang Driver #9850
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Cherry-pick of #9824
This change moves arm64e pointer authentication flag computation from the DarwinClang toolchain to the base MachO toolchain. This makes the logic apply to all Mach-O target triples, not just Darwin ones.
Test for this in the Swift repo: swiftlang/swift#78613
rdar://141676141