Merge branch 'releases/gcc-12' into devel/omp/gcc-12

Merge up to r12-8891-g14a92220a2f061328aae32ee6b5cdc7f62375902 (4th Nov 2022)

Note: This includes in principle some OpenMP/libgomp commits, but those have
been cherry picked already.

diff --cc gcc/c/c-typeck.cc
Simple merge

diff --cc gcc/tree-cfg.cc
Simple merge