[6.0] Prefer toolchain's plugins to SDK plugins if the toolchain has stdlib #1592
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Description: For example, when using a swift.org toolchain, which contains the stdlib in the resource directory, we should use toolchain's SwiftMacros plugin instead of the platform's one. This is necessary because
@TaskLocal
now have become macros, and other projects within swift project must be using it (and thus be able to find the macro).Scope/Impact:
Risk: Low
Testing: CI testing and @rintaro manually verified
Reviewed by: @ktoso (making cherry-pick on behalf of @rintaro who did the PR)
Original PR: #1590