Fix RISC-V build failure for go language.

	gcc/go/
	* go-gcc.cc (Gcc_backend::Gcc_backend): Add BUILT_IN_ATOMIC_FETCH_AND_1
	and BUILT_IN_ATOMIC_FETCH_OR_1.

From-SVN: r271790

gcc/go/ChangeLog

+2019-05-30  Jim Wilson  <jimw@sifive.com>
+
+	* go-gcc.cc (Gcc_backend::Gcc_backend): Add BUILT_IN_ATOMIC_FETCH_AND_1
+	and BUILT_IN_ATOMIC_FETCH_OR_1.
+
 2019-05-16  Cherry Zhang  <cherryyz@google.com>
 
 	* go-gcc.cc (Gcc_backend::Gcc_backend): Define atomic builtins.

gcc/go/go-gcc.cc

@@ -871,6 +871,8 @@ Gcc_backend::Gcc_backend()
                                NULL_TREE);
   this->define_builtin(BUILT_IN_ATOMIC_AND_FETCH_1, "__atomic_and_fetch_1", NULL,
                        t, false, false);
+  this->define_builtin(BUILT_IN_ATOMIC_FETCH_AND_1, "__atomic_fetch_and_1", NULL,
+                       t, false, false);
 
   t = build_function_type_list(unsigned_char_type_node,
                                ptr_type_node,
@@ -879,6 +881,8 @@ Gcc_backend::Gcc_backend()
                                NULL_TREE);
   this->define_builtin(BUILT_IN_ATOMIC_OR_FETCH_1, "__atomic_or_fetch_1", NULL,
                        t, false, false);
+  this->define_builtin(BUILT_IN_ATOMIC_FETCH_OR_1, "__atomic_fetch_or_1", NULL,
+                       t, false, false);
 }
 
 // Get an unnamed integer type.