Where is __builtin_dump_struct implemented?

I can’t seem to find the definition of __builtin_dump_struct.

I checked in: clang/lib/CodeGen/CGBuiltin.cpp
but, there are no mentions of “dump_struct” or relevant ones for “dump”

It appears to be clang/lib/Sema/SemaChecking.cpp, there’s a BuiltinDumpStructGenerator. Bit of a weird place really.