Doug Gregor a23d39bdfb [Macros] Mangle attached macro expansions based only on syntactic information ...

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.

2023-04-11 23:40:28 -04:00

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