[clang] #101784 part 2: fix error handling of TranslationUnit.reparse (PR #102410)

[via cfe-commits]

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@@ -152,6 +152,41 @@ def b(x: str | bytes) -> bytes:
 ### Exception Classes ###
 
 
+class CXError(Exception):
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TsXor wrote:

I looked at C header and found that `clang_parseTranslationUnit` and `clang_createTranslationUnit` actually swallows error code. To be unified, we should use `clang_parseTranslationUnit2` and `clang_createTranslationUnit2` which outputs value with pointers and return error code.

https://github.com/llvm/llvm-project/pull/102410