Merge branch 'releases/gcc-11' into devel/omp/gcc-11

Merge from 250f234988b6231669a720c52101d3686d64507
(last common commit of GCC 11+12, one commit before tag basepoints/gcc-12)
up to current releases/gcc-11, which is 'Daily bump.'
commit e3f08b40a1f7195f72bcb1651884562c4b891157 (May 14, 2021)

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

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

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

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

diff --cc gcc/cp/semantics.c
index ba7d869cdb5ebddd87f5d11fc94955c72bfb3313,3a6468fd5f3b5a4033117207f99f8f65079829e2..2ef838df37bbb0c6296e75ec18707006913e3708
--- 1/gcc/cp/semantics.c
--- 2/gcc/cp/semantics.c
+++ b/gcc/cp/semantics.c
@@@ -6583,9 -6527,8 +6583,9 @@@ finish_omp_clauses (tree clauses, enum 
       has been seen, -2 if mixed inscan/normal reduction diagnosed.  */
    int reduction_seen = 0;
    bool allocate_seen = false;
-   bool detach_seen = false;
+   tree detach_seen = NULL_TREE;
    bool mergeable_seen = false;
 +  bool oacc_gang_seen = false;
  
    bitmap_obstack_initialize (NULL);
    bitmap_initialize (&generic_head, &bitmap_default_obstack);

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

diff --cc gcc/fortran/openmp.c
Simple merge

diff --cc gcc/internal-fn.c
Simple merge

diff --cc gcc/omp-low.c
Simple merge

diff --cc gcc/params.opt
Simple merge

diff --cc gcc/testsuite/c-c++-common/goacc/kernels-decompose-ice-1.c
Simple merge

diff --cc gcc/tree-vect-stmts.c
Simple merge