test: add missing math function to test-arm-math-illegal-instruction.js

Author: marsonya

test/parallel/test-arm-math-illegal-instruction.js

@@ -15,6 +15,7 @@ Math.atan(-0.5);
 Math.atanh(-0.5);
 Math.cbrt(-0.5);
 Math.ceil(-0.5);
+Math.clz32(-0.5);
 Math.cos(-0.5);
 Math.cosh(-0.5);
 Math.exp(-0.5);