8228340: JVMCI deleteGlobalHandle doesn't delete the handle

Add missing call to OopStorage::release() when deleting global handles in JVMCI to prevent handles leak.

Reviewed-by: kvn, dlong

src/hotspot/share/jvmci/jvmci.cpp

@@ -93,6 +93,14 @@ jobject JVMCI::make_global(const Handle& obj) {
   return res;
 }
 
+void JVMCI::destroy_global(jobject handle) {
+  // Assert before nulling out, for better debugging.
+  assert(is_global_handle(handle), "precondition");
+  oop* oop_ptr = reinterpret_cast<oop*>(handle);
+  NativeAccess<>::oop_store(oop_ptr, (oop)NULL);
+  object_handles()->release(oop_ptr);
+}
+
 bool JVMCI::is_global_handle(jobject handle) {
   const oop* ptr = reinterpret_cast<oop*>(handle);
   return object_handles()->allocation_status(ptr) == OopStorage::ALLOCATED_ENTRY;

src/hotspot/share/jvmci/jvmci.hpp

@@ -92,6 +92,7 @@ class JVMCI : public AllStatic {
   static void initialize_compiler(TRAPS);
 
   static jobject make_global(const Handle& obj);
+  static void destroy_global(jobject handle);
   static bool is_global_handle(jobject handle);
 
   static jmetadata allocate_handle(const methodHandle& handle);

src/hotspot/share/jvmci/jvmciCompilerToVM.cpp

@@ -2181,8 +2181,7 @@ C2V_VMENTRY_NULL(jobject, getObject, (JNIEnv* env, jobject, jobject x, long disp
 C2V_VMENTRY(void, deleteGlobalHandle, (JNIEnv* env, jobject, jlong h))
   jobject handle = (jobject)(address)h;
   if (handle != NULL) {
-    assert(JVMCI::is_global_handle(handle), "Invalid delete of global JNI handle");
-    *((oop*)handle) = NULL; // Mark the handle as deleted, allocate will reuse it
+    JVMCI::destroy_global(handle);
   }
 }