String literals mangling issue

[justinvp]

From comment:

However, it exposed a different problem in CppCodeGen. There is a problem with string literals mangling: __load_string_literal("!"#$%&*;<=>@[]^_{|}");. The quote inside the string has to be prefixed with`.

[jkotas]

@A-And Could you please take a look when you get a chance? It should be easy fix.

[jkotas]

Fixed by #1728