Add a clang-tidy error again to show how Travis CI works

Author: aheejin

clang-tidy-diff.sh

@@ -1,7 +1,8 @@
 #!/bin/bash
 
-# In settings in which build directory is different than binaryen/, we don't
-# have this file in binaryen/, so we skip the test.
+# In some Travis CI settings in which the build directory is a subdirectory of
+# binaryen/, we don't have the compilation database file in binaryen/. We skip
+# the test in this case.
 if [ ! -f compile_commands.json ]
 then
   exit 0

src/passes/pass.cpp

@@ -698,7 +698,9 @@ void PassRunner::handleAfterEffects(Pass* pass, Function* func) {
 int PassRunner::getPassDebug() {
   static const int passDebug =
     getenv("BINARYEN_PASS_DEBUG") ? atoi(getenv("BINARYEN_PASS_DEBUG")) : 0;
-  // int WrongStyleTestVar = 3;
+  int testVar = 5;
+  if (passDebug > 0)
+    testVar = 3;
   return passDebug;
 }