Add linker option to include local symbols in the linker map.

Add linker option to include local symbols in  the linker map.

  PR 16566
  * ldlang.c (ld_is_local_symbol): New function. (print_input_section): Add code to display local symbols in the section.
  * ldlex.h (enum option_values): Add OPTION_PRINT_MAP_LOCALS and OPTION_PRINT_MAP_LOCALS.
  * lexsup.c (ld_options[]): Add entries for --print-map-locals and --no-print-map-locals.
  * NEWS: Mention the new feature.
  * ld.h (struct ld_config_type): Add print_map_locals field.
  * ld.texi: Document the new command line option.
  * testsuite/ld-scripts/sizeof.s: Add a local symbol.
  * testsuite/ld-scripts/map-locals.d: New test control file.
  * testsuite/ld-scripts/map-address.exp: Run the new test.