[Bug middle-end/101720] compile time hog with -g -O2

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101720

--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
For the C testcase I see

 variable tracking                  :   2.49 (  1%)   0.00 (  0%)   2.48 (  1%)
   28M (  4%)
 var-tracking dataflow              : 102.67 ( 47%)   0.00 (  0%) 102.68 ( 47%)
  226k (  0%)
 var-tracking emit                  :  54.60 ( 25%)   0.00 (  0%)  54.60 ( 25%)
   22M (  3%)

so that's a classical var-tracking duplicate.  I suggest to track the C++
testcase here and ignore the C testcase (you can split it out to a separate
bug).