[clang] #101784 part 1: introduce ctyped in an independent manner (PR #101941)

[Jannick Kremer via cfe-commits]

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DeinAlptraum wrote:

Regarding the segfault: this was a purely local problem for me, the function runs just fine for me now, and has always run fine in tests in the CI.
I only left that comment to indicate that I couldn't test that specific part.

https://github.com/llvm/llvm-project/pull/101941