Fix last issue with GC bridge comparison and enable all tests

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

@@ -676,6 +676,15 @@ processing_stw_step (void)
 	dyn_array_ptr_init (&dfs_stack);
 	dyn_array_int_init (&merge_array);
 
+	/*
+	Overflow collections can call processing_stw_step twice. If that happens we have to reset
+	the hash table to the initial state. The previously processed data are no longer valid and
+	we get a new set of of registered bridges.
+	*/
+	if (sgen_hash_table_num_entries(&hash_table) != 0) {
+		free_data();
+	}
+
 	current_time = 0;
 	/*
 	First we insert all bridges into the hash table and then we do dfs1.

src/tests/GC/Features/Bridge/Bridge.cs

@@ -405,9 +405,9 @@ static void SetupFragmentation<TBridge, TNonBridge>()
 
     public static int Main(string[] args)
     {
-//        TestLinkedList(); // Crashes, but only in this multithreaded variant, also only on osx for me
-        RunGraphTest(SetupFragmentation<Bridge14, NonBridge14>); // This passes but the following crashes ??
-//        RunGraphTest(SetupFragmentation<Bridge, NonBridge>);
+        TestLinkedList();
+        RunGraphTest(SetupFragmentation<Bridge14, NonBridge14>);
+        RunGraphTest(SetupFragmentation<Bridge, NonBridge>);
         RunGraphTest(SetupLinks);
         RunGraphTest(SetupLinkedFan);
         RunGraphTest(SetupInverseFan);
@@ -416,7 +416,7 @@ public static int Main(string[] args)
         RunGraphTest(SetupSelfLinks);
         RunGraphTest(NestedCycles);
         RunGraphTest(FauxHeavyNodeWithCycles);
-//        RunGraphTest(Spider); // Crashes
+        RunGraphTest(Spider);
         return 100;
     }
 }