Merge pull request #20922 from LinHu2016/fix_unsafe_issue

Fix potential issue in initializing unsafeIndexableHeaderSize

Author: amicic

runtime/gc_modron_startup/mminit.cpp

@@ -3325,11 +3325,8 @@ initializeIndexableObjectHeaderSizes(J9JavaVM* vm)
 #else /* defined(J9VM_ENV_DATA64) */
 	setIndexableObjectHeaderSizeWithoutDataAddress(vm);
 #endif /* defined(J9VM_ENV_DATA64) */
-	if (MM_GCExtensions::getExtensions(vm)->isVirtualLargeObjectHeapEnabled) {
-		vm->unsafeIndexableHeaderSize = 0;
-	} else {
-		vm->unsafeIndexableHeaderSize = vm->contiguousIndexableHeaderSize;
-	}
+	/* set default unsafeIndexableHeaderSize */
+	vm->unsafeIndexableHeaderSize = vm->contiguousIndexableHeaderSize;
 }
 
 #if defined(J9VM_ENV_DATA64)
@@ -3356,7 +3353,6 @@ setIndexableObjectHeaderSizeWithoutDataAddress(J9JavaVM* vm)
 		vm->contiguousIndexableHeaderSize = sizeof(J9IndexableObjectContiguousFull);
 		vm->discontiguousIndexableHeaderSize = sizeof(J9IndexableObjectDiscontiguousFull);
 	}
-	vm->unsafeIndexableHeaderSize = vm->contiguousIndexableHeaderSize;
 }
 
 #if defined(OMR_GC_CONCURRENT_SCAVENGER)