Added compile support for Clang 18.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 73.33333% with 8 lines in your changes are missing coverage. Please review.

Project coverage is 97.88%. Comparing base (dce0a67) to head (18cc523).

Files	Patch %	Lines
DPrint.cpp	56.25%	7 Missing :warning:
CodeGenerator.cpp	88.88%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #614 +/- ## ========================================== - Coverage 97.94% 97.88% -0.06% ========================================== Files 27 27 Lines 5061 5067 +6 ========================================== + Hits 4957 4960 +3 - Misses 104 107 +3 ``` | [Flag](https://app.codecov.io/gh/andreasfertig/cppinsights/pull/614/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Andreas+Fertig) | Coverage Δ | | |---|---|---| | [ubuntu](https://app.codecov.io/gh/andreasfertig/cppinsights/pull/614/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Andreas+Fertig) | `97.82% <73.33%> (-0.06%)` | :arrow_down: | | [ubuntu-libcxx](https://app.codecov.io/gh/andreasfertig/cppinsights/pull/614/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Andreas+Fertig) | `97.88% <73.33%> (-0.06%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Andreas+Fertig#carryforward-flags-in-the-pull-request-comment) to find out more.

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