Experiment with GC stress logging

Author: cshung

src/coreclr/gc/gc.h

@@ -348,7 +348,7 @@ inline bool IsServerHeap()
 #define MAX_LONGPATH 1024
 #endif // MAX_LONGPATH
 
-// #define TRACE_GC
+#define TRACE_GC
 // #define SIMPLE_DPRINTF
 
 #ifdef TRACE_GC

src/tests/GC/API/Frozen/Frozen.cs

@@ -180,7 +180,7 @@ private static unsafe int Main()
             GC.Collect();
             Console.WriteLine(root.next.next != null);
             frozenSegment.Release();
-            return 100;
+            throw new Exception("Intentional failure");
         }
     }
 }