[Bug debug/86462] New: [9 Regression] Quite huge debug info size increase introduced in r262511

[marxin at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86462

            Bug ID: 86462
           Summary: [9 Regression] Quite huge debug info size increase
                    introduced in r262511
           Product: gcc
           Version: 9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: debug
          Assignee: unassigned at gcc dot gnu.org
          Reporter: marxin at gcc dot gnu.org
                CC: rguenth at gcc dot gnu.org
  Target Milestone: ---

Buidling induct2.f90 from polyhedron benchmark:
https://www.polyhedron.com/web_images/documents/pb11.zip

$ gfortran induct2.f90 -O2 -g -c && du -hs induct2.o

$ bloaty bad.o -- good.o
     VM SIZE                          FILE SIZE
 ++++++++++++++ GROWING            ++++++++++++++
  [ = ]       0 .rela.debug_ranges +84.5Ki +21e2%
  [ = ]       0 .rela.debug_info   +22.2Ki   +24%
  [ = ]       0 .debug_info        +1.02Ki  +7.5%
  [ = ]       0 .debug_ranges          +36   +78%
  [ = ]       0 .debug_abbrev          +16  +2.5%

  [ = ]       0 TOTAL               +107Ki   +24%