[Macros] Enable global peer macros. #63598
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Global peer macro expansions are not injected into the AST. Instead, they are visited as "auxiliary declarations" when needed, such as in the decl checker and during SILGen. This is the same mechanism used for local property wrappers and local lazy variables.
…criminator when creating the macro expansion context.
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Global peer macro expansions are not injected into the AST. Instead, they are visited as "auxiliary declarations" when needed, such as in the decl checker and during SILGen. This is the same mechanism used for local property wrappers and local lazy variables.
Note that peer macros are not yet expanded during name lookup.