[6.2] Use mergeable symbols in embedded #8757
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Cherry-pick of #8654.
Explanation: To workaround proper support for the Embedded Swift linkage model in SwiftPM, this PR updates the build plan to include -Xfrontend -mergeable symbols when building Embedded targets. This is a workaround/stop-gap solution until we can implement #8653. Fixes: #8648
Scope: limited to Embedded Swift support.
Risk: low due to limited scope.
Testing: New automated tests added to the test suite.
Issue: rdar://151021042
Reviewer: @dschaefer2