Helper::findVariableScope(): performance tweak (#139)

Using `isset()` is significantly faster than a call to `in_array()` and as the PHPCS native `Tokens` class already contains a property representing the tokens being checked for here, we may as well use it.

Author: jrfnl

VariableAnalysis/Lib/Helpers.php

@@ -316,7 +316,7 @@ public static function findVariableScope(File $phpcsFile, $stackPtr) {
         if (($scopeCode === T_FUNCTION) || ($scopeCode === T_CLOSURE)) {
           return $scopePtr;
         }
-        if (in_array($scopeCode, [T_CLASS, T_ANON_CLASS, T_INTERFACE, T_TRAIT])) {
+        if (isset(Tokens::$ooScopeTokens[$scopeCode]) === true) {
           $in_class = true;
         }
       }