[5.9-20230510] [Macros] Improve diagnostics for missing macro implementation #65852
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…ang#65814) We should no longer say "macro implementation must be provided via '-load-plugin-library'" as there are multiple ways to pick up a macro dependency. Here's an improved version: > warning: external macro implementation type 'MissingModule.MissingType' could not be found for macro 'missingMacro1'; the type must be public and provided by a macro target in a Swift package, or via '-plugin-path' or '-load-plugin-library'
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Cherry-pick #65814
-load-plugin-libraryto load plugin libraries, whereas most developers should actually be using a Swift package dependency for a self-defined or open-source macro implementation.