[Bug lto/78140] [7 Regression] libxul -flto uses 1GB more memory than gcc-6

[jamborm at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78140

--- Comment #27 from Martin Jambor <jamborm at gcc dot gnu.org> ---
I have submitted a patch to the mailing list, which re-uses
value_ranges and ipa_bits in jump functions and manages to save more
than one gigabyte of memory:

https://gcc.gnu.org/ml/gcc-patches/2017-02/msg01369.html

Unfortunately, something else has added a further gigabyte to WPA of
FF in the last week:

  | compiler            | wpa mem (GB) |
  |---------------------+--------------|
  | gcc 6 branch        |         3.86 |
  | trunk rev. 245382   |         5.21 |
  | patched rev. 245382 |         4.06 |
  | trunk rev. 245595   |         6.59 |
  | patched rev. 245595 |         5.25 |

I will try bisecting to find if there is one single change responsible
for this.