LibJS: Constant fold LogicalExpression

Logical expressions like `true || false` are now constant folded. This
also allows for dead code elimination if we know the right-hand side of
the expression will never be evaluated (such as `false && f()` or
`true || f()`).

In the test suites, the values are now being constant folded at compile
time. To ensure that the actual evaluation logic is being called
properly, I had to duplicate the tests and call them via a function so
the compiler would not optimize the evaluation logic away.

This also demotes `NaN` and `Infinity` identifiers to `nan` and
`inf` double literals, which will further help with const folding.

Libraries/LibJS/Bytecode/Generator.cpp

@@ -1754,6 +1754,14 @@ CodeGenerationErrorOr<Optional<ScopedOperand>> Generator::maybe_generate_builtin
         return add_constant(js_undefined());
     }
 
+    if (constant_name == "NaN"sv) {
+        return add_constant(js_nan());
+    }
+
+    if (constant_name == "Infinity"sv) {
+        return add_constant(js_infinity());
+    }
+
     if (!m_builtin_abstract_operations_enabled)
         return OptionalNone {};