[Bug sanitizer/84043] New: -fsanitize=alignment leads to massive compile time

[sduvan.gcc at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84043

            Bug ID: 84043
           Summary: -fsanitize=alignment leads to massive compile time
           Product: gcc
           Version: 7.2.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: sanitizer
          Assignee: unassigned at gcc dot gnu.org
          Reporter: sduvan.gcc at gmail dot com
                CC: dodji at gcc dot gnu.org, dvyukov at gcc dot gnu.org,
                    jakub at gcc dot gnu.org, kcc at gcc dot gnu.org, marxin at gcc dot gnu.org
  Target Milestone: ---

Created attachment 43244
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=43244&action=edit
Testcase

The tiny attached program, bug.C, leads to compile times that seem to be
exponential in the number of operator<<():s used.

I'm aware of bug 69656 but it was not clear to me that this was related to the
same underlying issue and also my testcase seems significantly smaller.