[patch][pr22217] Use the most recent decl for mangling

[Rafael Espíndola]

Currently clang will produce a @foo when given

int foo;
extern int foo __asm__("bar");

The attached patch makes it produce a @bar, which is what gcc produces.

I am confused by the output changes in the microsoft abi tests.
Hopefully someone more familiar with it can comment on why using a
more recent decl causes problems and has an idea of what should be
changed to accommodate it.

Cheers,
Rafael
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