openmp: Notice reduction decl in outer contexts after adding it to shared [PR93515]

If we call omp_add_variable, following omp_notice_variable will already find it
on that construct and not go through outer constructs, the following patch fixes that.
Note, this still doesn't follow OpenMP 5.0 semantics on target combined with other
constructs with reduction/lastprivate/linear clauses, will handle that for GCC11.

2020-02-06  Jakub Jelinek  <jakub@redhat.com>

	PR libgomp/93515
	* gimplify.c (gimplify_scan_omp_clauses) <do_notice>: If adding
	shared clause, call omp_notice_variable on outer context if any.

gcc/ChangeLog

+2020-02-06  Jakub Jelinek  <jakub@redhat.com>
+
+	PR libgomp/93515
+	* gimplify.c (gimplify_scan_omp_clauses) <do_notice>: If adding
+	shared clause, call omp_notice_variable on outer context if any.
+
 2020-02-05  Jason Merrill  <jason@redhat.com>
 
 	PR c++/92003

gcc/gimplify.c

@@ -9464,9 +9464,13 @@ gimplify_scan_omp_clauses (tree *list_p, gimple_seq *pre_p,
 				  == POINTER_TYPE))))
 		    omp_firstprivatize_variable (outer_ctx, decl);
 		  else
-		    omp_add_variable (outer_ctx, decl,
-				      GOVD_SEEN | GOVD_SHARED);
-		  omp_notice_variable (outer_ctx, decl, true);
+		    {
+		      omp_add_variable (outer_ctx, decl,
+					GOVD_SEEN | GOVD_SHARED);
+		      if (outer_ctx->outer_context)
+			omp_notice_variable (outer_ctx->outer_context, decl,
+					     true);
+		    }
 		}
 	    }
 	  if (outer_ctx)