[patch][pr14974] Change what #pragma weak matches

[Rafael Espíndola]

Gcc applies a pragma weak to a decl if it matches the mangled name. So
far clang applies it if matches the "plain" name. This patches tries
to be a compromise. We don't expose the mangling itself, but we only
check for matches in decls that are not mangled.

Cheers,
Rafael
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