8012052: java/lang/invoke/6987555/Test6987555.java crashes with assert(mcs !=...

8012052: java/lang/invoke/6987555/Test6987555.java crashes with assert(mcs != NULL) failed: MethodCounters cannot be NULL.
Summary: Skip counter decay if the MethodCounters is NULL in NonTieredCompPolicy::delay_compilation().
Reviewed-by: kvn, dholmes

src/share/vm/runtime/compilationPolicy.cpp

@@ -297,9 +297,10 @@ void NonTieredCompPolicy::reprofile(ScopeDesc* trap_scope, bool is_osr) {
 // that it's recommended to delay the complation of this method.
 void NonTieredCompPolicy::delay_compilation(Method* method) {
   MethodCounters* mcs = method->method_counters();
-  assert(mcs != NULL, "MethodCounters cannot be NULL");
-  mcs->invocation_counter()->decay();
-  mcs->backedge_counter()->decay();
+  if (mcs != NULL) {
+    mcs->invocation_counter()->decay();
+    mcs->backedge_counter()->decay();
+  }
 }
 
 void NonTieredCompPolicy::disable_compilation(Method* method) {