When compiling manifests, filter out remarks emitted by new Swift compiler driver (#3290)
When compiling manifests, filter out remarks emitted by new Swift compiler driver (#3290)

* Temporary workaround to filter out remarks emitted by Swift compiler driver in newer toolchains.  This remark is temporary, but is causing spurious test failures for tests that make sure there are no diagnostics.

* Add Radar number to comment about temporary workaround.
apple/swift-package-manager,apple/swift-package-manager,apple/swift-package-manager,abertelrud/swift-package-manager,abertelrud/swift-package-manager,apple/swift-package-manager,abertelrud/swift-package-manager,apple/swift-package-manager,abertelrud/swift-package-manager,abertelrud/swift-package-manager