[5.9][Driver] Derive '-external-plugin-path' #65669
Merged
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Cherry-pick #65473 into release/5.9
Explanation: When the current toolchain is not a Xcode toolchain, derive '-external-plugin-path' poinintng Xcode plugins paths, so toolchains from
swift.org
can use plugins in Xcode. This change corresponds to swiftlang/swift-driver#1340Scope: Legacy C++ libDriver users (only SourceKit) in non-Xcode toolchains
Risk: Low
Testig: Passes exiting test-suite
Issue: rdar://108624128
Reviewer: Ben Barham (@bnbarham)