[llvm] r204672 - DebugInfo: Add DW_AT_GNU_ranges_base to skeleton CUs

[Eric Christopher]

>
>    // Relocate to the beginning of the addr_base section, else 0 for the
>    // beginning of the one for this compile unit.
> -  if (Asm->MAI->doesDwarfUseRelocationsAcrossSections())
> +  // We could shave off some space if we deferred adding these attributes until
> +  // the end of the CU to see if we have a non-empty debug_addr and debug_ranges
> +  // sections so we don't bother with extra attributes and relocations.

Could probably add this at the same place that I'm adding DW_AT_ranges
to the skeleton CU.

-eric