[Bug middle-end/116330] -fcompare-debug -gno-statement-frontiers failure with -O3 -march=znver3 -mshstk when building qtbase-6.7.2

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=116330

--- Comment #2 from Sam James <sjames at gcc dot gnu.org> ---
I'll kick off a reduction.