StackMap: Always load and store unalign.

Now that we can have a mix of Quick and Optimized code in an .oat
file, a CodeInfo object is not necessarily word aligned.

Change-Id: Ic6c5d1a2c6e20363436726a0708b0764b5a76caf
diff --git a/compiler/optimizing/stack_map_stream.h b/compiler/optimizing/stack_map_stream.h
index 63a0286..e1a5afe 100644
--- a/compiler/optimizing/stack_map_stream.h
+++ b/compiler/optimizing/stack_map_stream.h
@@ -105,8 +105,8 @@
         + ComputeStackMapsSize()
         + ComputeDexRegisterMapsSize()
         + ComputeInlineInfoSize();
-    // On ARM, CodeInfo data must be 4-byte aligned.
-    return RoundUp(size, kWordAlignment);
+    // Note: use RoundUp to word-size here if you want CodeInfo objects to be word aligned.
+    return size;
   }
 
   size_t ComputeStackMaskSize() const {