Changes to compile with gcc 4.6

Change-Id: I55908b3b98b49373ce948fd1f12e0a5cd56ae4f7
diff --git a/src/compiler/codegen/arm/Assemble.cc b/src/compiler/codegen/arm/Assemble.cc
index 43fb05e..9a1a30e 100644
--- a/src/compiler/codegen/arm/Assemble.cc
+++ b/src/compiler/codegen/arm/Assemble.cc
@@ -1566,7 +1566,7 @@
      */
 
     while (true) {
-        AssemblerStatus res = assembleInstructions(cUnit, NULL);
+        AssemblerStatus res = assembleInstructions(cUnit, 0);
         if (res == kSuccess) {
             break;
         } else {