ART: Use utils.h::RoundUp instead of explicit bit-fiddling

Change-Id: I249a2cfeb044d3699d02e13d42b8e72518571640
diff --git a/compiler/dex/quick/x86/assemble_x86.cc b/compiler/dex/quick/x86/assemble_x86.cc
index 58e2f42..0ce081b 100644
--- a/compiler/dex/quick/x86/assemble_x86.cc
+++ b/compiler/dex/quick/x86/assemble_x86.cc
@@ -1388,7 +1388,7 @@
   int offset = AssignInsnOffsets();
 
   /* Const values have to be word aligned */
-  offset = (offset + 3) & ~3;
+  offset = RoundUp(offset, 4);
 
   /* Set up offsets for literals */
   data_offset_ = offset;