https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65414
--- Comment #16 from Jakub Jelinek <jakub at gcc dot gnu.org> --- While I couldn't reproduce this on aarch64-linux, on arm-linux-gnueabihf without the revert all my bootstraps since Friday ended up with ICEs, both profiledbootstrap and normal bootstraps; for --with-default-libstdcxx-abi=c++98 builds somewhere in gnat-tools build (but with corrupted backtraces, didn't figure out anything useful yet how to debug) and for the default new C++ ABI builds somewhere during PCH creation in libstdc++. With the problematic patch reverted normal bootstrap build is now already in make check phase past the bootstrap failure point, and two differently configured profiledbootstraps are progressing nicely so far. But really don't have a short reproducer for either, sorry.
