[Bug c++/109531] Checking ICE with hash table checking failed: equal operator returns true for a pair of values with a different hash value

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109531

--- Comment #5 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
>'g++-13 -O2 -Wall -c ArithmeticSubtermGeneralization.ii' is enough to 
>reproduce.

Interesting because it was not for me, but I noticed that removing all of the
lines that begin with "#" is able to reproduce without any options only.
Anyways my current reproducing script is:
```
if !(~/upstream-gcc/libexec/gcc/x86_64-pc-linux-gnu/13.0.1/cc1plus -std=c++14
-fno-checking -quiet -Wfatal-errors $1 >& file1.out); then
  exit 1
fi
if !(~/upstream-gcc/libexec/gcc/x86_64-pc-linux-gnu/13.0.1/cc1plus -std=c++14
-quiet -Wfatal-errors $1 >& file.out); then
  if grep "hashtab_chk_error" file.out >&/dev/null; then
    exit 0
  fi
  exit 1
fi
if !(~/upstream-gcc/libexec/gcc/x86_64-pc-linux-gnu/13.0.1/cc1plus -std=c++14 
-march=znver3 -O2 -fno-strict-aliasing -Wall -quiet -Wfatal-errors $1 >&
file1.out); then
  if grep "hashtab_chk_error" file1.out >&/dev/null; then
    exit 0
  fi
  exit 1
fi
```

Yes it is more complex than a standard one would be because I want to reduce it
to be a valid testcase (the first run of cc1plus) and then I noticed sometimes
it reproduces with slightly different options so test with those.
Hopefully the -fno-checking is enough to force not checking hashtable checking
...