Reflection: add regression tests for printing boolean constant values

Add regression tests for the output of `ReflectionClassConstant::__toString()`
and `ReflectionConstant::__toString()` when the value of the constant is
boolean `true` or `false`. The `true` cases are already covered by some
existing tests, but it seems that the `false` cases are currently untested.

Author: DanielEScherzer

ext/reflection/tests/ReflectionClassConstant_toString.phpt

@@ -0,0 +1,39 @@
+--TEST--
+ReflectionClassConstant::__toString() and class constant display
+--FILE--
+<?php
+
+class Demo {
+    public const IS_TRUE = true;
+    public const IS_FALSE = false;
+}
+
+echo new ReflectionClassConstant(Demo::class, 'IS_TRUE');
+echo new ReflectionClassConstant(Demo::class, 'IS_FALSE');
+
+echo new ReflectionClass(Demo::class);
+
+?>
+--EXPECTF--
+Constant [ public bool IS_TRUE ] { 1 }
+Constant [ public bool IS_FALSE ] {  }
+Class [ <user> class Demo ] {
+  @@ %s %d-%d
+
+  - Constants [2] {
+    Constant [ public bool IS_TRUE ] { 1 }
+    Constant [ public bool IS_FALSE ] {  }
+  }
+
+  - Static properties [0] {
+  }
+
+  - Static methods [0] {
+  }
+
+  - Properties [0] {
+  }
+
+  - Methods [0] {
+  }
+}

ext/reflection/tests/ReflectionConstant_toString.phpt

@@ -0,0 +1,15 @@
+--TEST--
+ReflectionConstant::__toString()
+--FILE--
+<?php
+
+const IS_TRUE = true;
+const IS_FALSE = false;
+
+echo new ReflectionConstant('IS_TRUE');
+echo new ReflectionConstant('IS_FALSE');
+
+?>
+--EXPECT--
+Constant [ bool IS_TRUE ] { 1 }
+Constant [ bool IS_FALSE ] {  }