Fix cpplint readability/fn_size issues

Change-Id: I1efdb07a948a2af49db1a9d21ccab16dacc03a54
diff --git a/compiler/llvm/gbc_expander.cc b/compiler/llvm/gbc_expander.cc
index a2c6998..a7793ae 100644
--- a/compiler/llvm/gbc_expander.cc
+++ b/compiler/llvm/gbc_expander.cc
@@ -3791,7 +3791,7 @@
   }
   UNIMPLEMENTED(FATAL) << "Unexpected GBC intrinsic: " << static_cast<int>(intr_id);
   return NULL;
-}
+}  // NOLINT(readability/fn_size)
 
 } // anonymous namespace