Emit name only in debug mode.

Change-Id: I5de11b98ae07eccce2ce12d55867ae8d4a98288c
diff --git a/src/compiler_llvm/jni_compiler.cc b/src/compiler_llvm/jni_compiler.cc
index 801a692..27fe6db 100644
--- a/src/compiler_llvm/jni_compiler.cc
+++ b/src/compiler_llvm/jni_compiler.cc
@@ -99,7 +99,9 @@
   // "this" object pointer for non-static
   // "class" object pointer for static
   for (unsigned i = 0; arg_iter != arg_end; ++i, ++arg_iter) {
+#if !defined(NDEBUG)
     arg_iter->setName(StringPrintf("a%u", i));
+#endif
     if (arg_iter->getType() == irb_.getJObjectTy()) {
       ++sirt_size;
     }