[5.9][Macros] Set -external-plugin-path when the toolchain is not Xcode #1340
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Cherry-pick #1320 into
release/5.9
Explanation: swiftlang/swift#64376 implemented "plugin server". This change is a corresponding change in
swift-driver
that utilize the plugin-server when the currentswiftc
is not in the Xcode.Scope: Frontend options in macOS environment.
Risk: low
Testing: Added a regression test case
Issues: rdar://108525615
Reviewer: Artem Chickin (@artemcm)