Segmentation fault during coverage collection

[pavelkryukov]

I observe segmentation fault while collecting code coverage.
The binary is built with Clang 11: clang++ test.cpp --coverage -std=c++17 -g -O0

If code coverage is disabled during the build, or code is insignificantly changed, segfault disappears.
Address sanitizer shows no warnings regardless of coverage enablement.

Compiler Explorer link: https://godbolt.org/z/n53ETGrMz
You can substitute some code lines with commented ones to make segfault disappear.
Strangely, error appears while using std::reverse_iterator instead of Boost one.

I could not reproduce it with Clang 12 or newer, but there might be "dynamic" changes to hide the root causes.