no need to set the attribute for non-global vars

Author: cedric-anne

src/Analyser/MutatingScope.php

@@ -4172,7 +4172,9 @@ public function isUndefinedExpressionAllowed(Expr $expr): bool
 	public function assignVariable(string $variableName, Type $type, Type $nativeType, TrinaryLogic $certainty, bool $isGlobal = false): self
 	{
 		$node = new Variable($variableName);
-		$node->setAttribute(self::IS_GLOBAL_ATTRIBUTE_NAME, $isGlobal || $this->isGlobalVariable($variableName));
+		if ($isGlobal || $this->isGlobalVariable($variableName)) {
+			$node->setAttribute(self::IS_GLOBAL_ATTRIBUTE_NAME, true);
+		}
 
 		$scope = $this->assignExpression($node, $type, $nativeType);
 		if ($certainty->no()) {