[sgen] Transition to GC Unsafe in mono_gc_wait_for_bridge_processing (#55681)

* [sgen] Transition to GC Unsafe in mono_gc_wait_for_bridge_processing

Mark it as an external only API.  In the runtime, use
mono_gc_wait_for_bridge_processing_internal.

Author: lambdageek

src/mono/mono/metadata/sgen-bridge.c

@@ -54,6 +54,14 @@ volatile gboolean mono_bridge_processing_in_progress = FALSE;
  */
 void
 mono_gc_wait_for_bridge_processing (void)
+{
+	MONO_ENTER_GC_UNSAFE;
+	mono_gc_wait_for_bridge_processing_internal ();
+	MONO_EXIT_GC_UNSAFE;
+}
+
+void
+mono_gc_wait_for_bridge_processing_internal (void)
 {
 	if (!mono_bridge_processing_in_progress)
 		return;
@@ -738,6 +746,11 @@ mono_gc_wait_for_bridge_processing (void)
 {
 }
 
+void
+mono_gc_wait_for_bridge_processing_internal (void)
+{
+}
+
 MonoGCBridgeObjectKind
 sgen_bridge_class_kind (MonoClass *klass)
 {

src/mono/mono/metadata/sgen-bridge.h

@@ -103,7 +103,7 @@ typedef struct {
  */
 MONO_API void mono_gc_register_bridge_callbacks (MonoGCBridgeCallbacks *callbacks);
 
-MONO_API void mono_gc_wait_for_bridge_processing (void);
+MONO_API MONO_RT_EXTERNAL_ONLY void mono_gc_wait_for_bridge_processing (void);
 
 MONO_END_DECLS
 

src/mono/mono/metadata/sgen-client-mono.h

@@ -250,10 +250,13 @@ sgen_client_bridge_processing_stw_step (void)
 	sgen_bridge_processing_stw_step ();
 }
 
+void
+mono_gc_wait_for_bridge_processing_internal (void);
+
 static void G_GNUC_UNUSED
 sgen_client_bridge_wait_for_processing (void)
 {
-	mono_gc_wait_for_bridge_processing ();
+	mono_gc_wait_for_bridge_processing_internal ();
 }
 
 static void G_GNUC_UNUSED

src/mono/mono/metadata/sgen-mono.c

@@ -2848,7 +2848,7 @@ sgen_client_ensure_weak_gchandles_accessible (void)
 	 * should wait for bridge processing but would fail to do so.
 	 */
 	if (G_UNLIKELY (mono_bridge_processing_in_progress))
-		mono_gc_wait_for_bridge_processing ();
+		mono_gc_wait_for_bridge_processing_internal ();
 }
 
 void*