8082782: vm crash on StressRedefineWithoutBytecodeCorruption fails with assert(((Metadata*)obj)->is_valid()) failed: obj is valid

Walk compile task for Method* to not deallocate, store methods in methodHandle while compile task is being taken off compile queue

Reviewed-by: dcubed, sspitsyn

hotspot/src/share/vm/runtime/thread.cpp

@@ -2739,6 +2739,9 @@ void JavaThread::metadata_do(void f(Metadata*)) {
     if (ct->env() != NULL) {
       ct->env()->metadata_do(f);
     }
+    if (ct->task() != NULL) {
+      ct->task()->metadata_do(f);
+    }
   }
 }