[Macros] Mangle attached macro expansions based only on syntactic information #65032
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The mangling of attached macro expansions based on the declaration to which they are attached requires semantic information (specifically, the interface type of that declaration) that caused cyclic dependencies during type checking. Replace the mangling with a less-complete mangling that only requires syntactic information from the declaration, i.e., the name of the declaration to which the macro was attached.
This eliminates reference cycles that occur with attached macros that produce arbitrary names.