8009836: nsk/regression/b4222717 fails with empty stack trace

Summary: Some zeroing was missed for bug 8003553, causing empty stack traces and Xcom crashes, add back zeroing to metablock
Reviewed-by: dholmes, rbackman

src/share/vm/memory/metablock.cpp

@@ -65,9 +65,10 @@ Metablock* Metablock::initialize(MetaWord* p, size_t word_size) {
   }
 
   Metablock* result = (Metablock*) p;
+
+  // Clear the memory
+  Copy::fill_to_aligned_words((HeapWord*)result, word_size);
 #ifdef ASSERT
-  // Add just to catch missing initializations
-  Copy::fill_to_words((HeapWord*) result, word_size, 0xf1f1f1f1);
   result->set_word_size(word_size);
 #endif
   return result;

src/share/vm/oops/constMethod.cpp

@@ -55,7 +55,7 @@ ConstMethod::ConstMethod(int byte_code_size,
   set_stackmap_data(NULL);
   set_code_size(byte_code_size);
   set_constMethod_size(size);
-  set_inlined_tables_length(sizes);
+  set_inlined_tables_length(sizes); // sets _flags
   set_method_type(method_type);
   assert(this->size() == size, "wrong size for object");
   set_name_index(0);
@@ -64,6 +64,7 @@ ConstMethod::ConstMethod(int byte_code_size,
   set_max_stack(0);
   set_max_locals(0);
   set_method_idnum(0);
+  set_size_of_parameters(0);
 }
 
 

src/share/vm/oops/method.cpp

@@ -87,6 +87,9 @@ Method::Method(ConstMethod* xconst, AccessFlags access_flags, int size) {
 #endif
   set_intrinsic_id(vmIntrinsics::_none);
   set_jfr_towrite(false);
+  set_force_inline(false);
+  set_hidden(false);
+  set_dont_inline(false);
   set_method_data(NULL);
   set_interpreter_throwout_count(0);
   set_vtable_index(Method::garbage_vtable_index);