Merge remote-tracking branch 'origin/releases/gcc-10' into devel/omp/gcc-10

Merge up to 981b776f02fa1c1a78bafd6cc00ea5c6c70abf75 (Aug 21, 2020)

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

diff --cc gcc/config/i386/i386.c
Simple merge

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

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

diff --cc gcc/doc/invoke.texi
Simple merge

diff --cc gcc/doc/sourcebuild.texi
Simple merge

diff --cc gcc/passes.def
Simple merge

diff --cc gcc/testsuite/lib/target-supports.exp
Simple merge

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

diff --cc gcc/tree.c
Simple merge