Add 3rd argument register to X86.

Implement more instructions.

Change-Id: I3af7bbaf18eedc6537f1cfc2d57c4f6106fb5164
diff --git a/src/compiled_method.cc b/src/compiled_method.cc
index bf88880..3ac32d4 100644
--- a/src/compiled_method.cc
+++ b/src/compiled_method.cc
@@ -133,7 +133,7 @@
     case kThumb2:
       return RoundUp(offset, kArmAlignment);
     case kX86:
-      return offset;
+      return RoundUp(offset, kX86Alignment);
     default:
       LOG(FATAL) << "Unknown InstructionSet: " << static_cast<int>(instruction_set);
       return 0;