8270794: Avoid loading Klass* twice in TypeArrayKlass::oop_size()

src/hotspot/share/oops/typeArrayKlass.cpp

@@ -230,7 +230,7 @@ Klass* TypeArrayKlass::array_klass_or_null() {
 int TypeArrayKlass::oop_size(oop obj) const {
   assert(obj->is_typeArray(),"must be a type array");
   typeArrayOop t = typeArrayOop(obj);
-  return t->object_size();
+  return t->object_size(this);
 }
 
 void TypeArrayKlass::initialize(TRAPS) {

src/hotspot/share/oops/typeArrayOop.hpp

@@ -131,7 +131,7 @@ class typeArrayOopDesc : public arrayOopDesc {
   }
 
  public:
-  inline int object_size();
+  inline int object_size(const TypeArrayKlass* tk) const;
 };
 
 #endif // SHARE_OOPS_TYPEARRAYOOP_HPP

src/hotspot/share/oops/typeArrayOop.inline.hpp

@@ -31,8 +31,7 @@
 #include "oops/oop.inline.hpp"
 #include "oops/arrayOop.hpp"
 
-int typeArrayOopDesc::object_size() {
-  TypeArrayKlass* tk = TypeArrayKlass::cast(klass());
+int typeArrayOopDesc::object_size(const TypeArrayKlass* tk) const {
   return object_size(tk->layout_helper(), length());
 }
 

src/hotspot/share/opto/runtime.cpp

@@ -302,7 +302,7 @@ JRT_BLOCK_ENTRY(void, OptoRuntime::new_array_nozero_C(Klass* array_type, int len
   if ((len > 0) && (result != nullptr) &&
       is_deoptimized_caller_frame(current)) {
     // Zero array here if the caller is deoptimized.
-    int size = ((typeArrayOop)result)->object_size();
+    int size = TypeArrayKlass::cast(array_type)->oop_size(result);
     BasicType elem_type = TypeArrayKlass::cast(array_type)->element_type();
     const size_t hs = arrayOopDesc::header_size(elem_type);
     // Align to next 8 bytes to avoid trashing arrays's length.