AK+Format: Make it possible to format string literals as pointers.

String literals are just pointers to a constant character. It should be
possible to format them as such. (The default is to print them as
strings still.)

AK/Tests/TestFormat.cpp

@@ -182,4 +182,10 @@ TEST_CASE(ensure_that_format_works)
     }
 }
 
+TEST_CASE(format_string_literal_as_pointer)
+{
+    const char* literal = "abc";
+    EXPECT_EQ(String::formatted("{:p}", literal), String::formatted("{:p}", reinterpret_cast<FlatPtr>(literal)));
+}
+
 TEST_MAIN(Format)