Revert "don't fill header"

This reverts commit 1d37750ce7.

nat.ts

@@ -136,7 +136,7 @@ module J2ME {
       }
 
       var weakRef = (<java.lang.ref.WeakReference>getHandle(addr));
-      weakRef.holder = ASM._gcMallocAtomic(4, 4);
+      weakRef.holder = ASM._gcMallocAtomic(4);
       i32[weakRef.holder >> 2] = targetAddr;
       ASM._gcRegisterDisappearingLink(weakRef.holder, targetAddr);
   };

vm/native/native.cpp

@@ -69,9 +69,9 @@ extern "C" {
     return (uintptr_t)GC_MALLOC(size);
   }
 
-  uintptr_t gcMallocAtomic(int32_t size, int32_t offset) {
+  uintptr_t gcMallocAtomic(int32_t size) {
     uintptr_t ptr = (uintptr_t)GC_MALLOC_ATOMIC(size);
-    memset((void*)(ptr + offset), 0, size - offset);
+    memset((void*)ptr, 0, size);
     return ptr;
   }
 

vm/runtime.ts

@@ -1345,7 +1345,7 @@ module J2ME {
     var addr;
 
     if (elementClassInfo instanceof PrimitiveClassInfo) {
-      addr = ASM._gcMallocAtomic(Constants.ARRAY_HDR_SIZE + size * (<PrimitiveArrayClassInfo>arrayClassInfo).bytesPerElement, Constants.ARRAY_HDR_SIZE);
+      addr = ASM._gcMallocAtomic(Constants.ARRAY_HDR_SIZE + size * (<PrimitiveArrayClassInfo>arrayClassInfo).bytesPerElement);
     } else {
       // We need to hold an integer to define the length of the array
       // and *size* references.