C++: fix trigraph parsing in macros.
Trigraphs must only be parsed before/during preprocessing. The preprocessor will now replace trigraphs with their standard form, and re-lexing in TranslationUnit will not try to parse any trigraph. Also added a few missing trigraphs: ??=, ??', ??! and ??-. Task-number: QTCREATORBUG-13253 Change-Id: I1723ed53b00090b878c22b83b7e963b647b65f72 Reviewed-by: Nikolai Kosjar <email@example.com>
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