[clang] Move SPELLING_CACHE into CodeCompletion (PR #177586)

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``````````diff
--- cindex.py	2026-01-23 13:37:29.000000 +0000
+++ cindex.py	2026-01-23 13:39:32.773083 +0000
@@ -3090,15 +3090,14 @@
         )
 
         def __getitem__(self, value: int):
             warnings.warn(self.deprecation_message, DeprecationWarning)
             return CompletionChunk.SPELLING_CACHE[CompletionChunkKind.from_id(value)]
-        
+
         def __contains__(self, value: int):
             warnings.warn(self.deprecation_message, DeprecationWarning)
             return CompletionChunkKind.from_id(value) in CompletionChunk.SPELLING_CACHE
-
 
     # Functions calls through the python interface are rather slow. Fortunately,
     # for most symbols, we do not need to perform a function call. Their spelling
     # never changes and is consequently provided by this spelling cache.
     SPELLING_CACHE = {

``````````

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https://github.com/llvm/llvm-project/pull/177586