Set the debug location for static init related functions(dtor and finalize) so we can generate valid debug info on AIX by invoking -g with clang or -debug-info-kind=limited with clang_cc1.
This also works for any other future targets who may use sinit and sterm functions for static initialization, where a direct call to dtor will be generated within finalize function body.
This patch also aims at validating that the debug info generated is correct for AIX sinit related functions.