Doug Gregor 339d31fabb [Macros] Add a frontend flag -Rmacro-loading to remark on macro resolution ...

Macro implementations can come from various locations associated with
different search paths. Add a frontend flag `-Rmacro-loading` to emit
a remark when each macro implementation module is resolved, providing
the kind of macro (shared library, executable, shared library loaded
via the plugin server) and appropriate paths. This allows one to tell
from the build load which macros are used.

Addresses rdar://110780311.

2023-08-25 15:09:49 -07:00

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