Bug 1429389

Please backport the following commit which helps the Parallel Installable Debuginfo Feature https://fedoraproject.org/wiki/Changes/ParallelInstallableDebuginfo:

commit 49fced1206db40c71208c201165d65f92c69cebe
Author: Mark Wielaard <mark>
Date:   Sun Mar 5 23:37:54 2017 +0100

    gas: Emit name, comp_dir and producer strings in .debug_str.
    
    Putting the name, comp_dir and producer strings in the .debug_str section
    makes it possible to share them across CUs. This saves a small amount of
    space (about ~20K on a glibc libc.so.6 build with debuginfo). And makes
    it easier for tools like rpm debugedit to adjust the source paths when
    generating separate debuginfo files.
    
    gas/
           * dwarf2dbg.c (out_debug_abbrev): Use DW_FORM_strp instead of
           DW_FORM_string for DW_AT_name, DW_AT_comp_dir and DW_AT_producer.
           (out_debug_info): Accept symbols to name, comp_dir and producer
           in the .debug_str section and emit those offsets not full strings.
           (out_debug_str): New function that outputs the strings for name,
           comp_dir and producer in .debug_str and generates symbols to
           those strings.
           (out_debug_line): Create a .debug_str section if necessary and
           call out_debug_str before calling out_debug_info.
           * testsuite/gas/aarch64/dwarf.d: Add extra section symbol to
           expected output.

https://sourceware.org/git/?p=binutils-gdb.git;a=commit;h=49fced1206db40c71208c201165d65f92c69cebe