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

Merge up to 6e81b0cf4ff75f65edfd2d83bfa2933f35ae66af (June 18, 2020)

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

diff --cc gcc/testsuite/c-c++-common/goacc/kernels-alias-ipa-pta-2.c
Simple merge

diff --cc gcc/testsuite/c-c++-common/goacc/kernels-alias-ipa-pta-4.c
Simple merge

diff --cc gcc/testsuite/c-c++-common/goacc/kernels-alias-ipa-pta.c
Simple merge