Merge remote-tracking branch 'origin/releases/gcc-11' into devel/omp/gcc-11

Merge up to f3c9f939d03db79eadb23c20ac55ec5aacb72fb1 (June 8, 2021)

diff --cc gcc/cp/cp-tree.h
Simple merge

diff --cc gcc/cp/decl.c
Simple merge

diff --cc gcc/cp/pt.c
Simple merge

diff --cc gcc/fortran/frontend-passes.c
Simple merge

diff --cc gcc/fortran/trans-decl.c
Simple merge

diff --cc gcc/fortran/trans.h
Simple merge