[clang] [clang] Refactor clang's keyword enable/disable mechanism to allow lldb to re-use it (PR #165323)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions h,cpp -- clang/include/clang/Basic/IdentifierTable.h clang/lib/Basic/IdentifierTable.cpp --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/clang/include/clang/Basic/IdentifierTable.h b/clang/include/clang/Basic/IdentifierTable.h
index 54500b95b..7062aea31 100644
--- a/clang/include/clang/Basic/IdentifierTable.h
+++ b/clang/include/clang/Basic/IdentifierTable.h
@@ -92,8 +92,7 @@ enum KeywordStatus {
   KS_Enabled,   // Enabled
 };
 
-KeywordStatus getKeywordStatus(const LangOptions &LangOpts,
-                               unsigned Flags);
+KeywordStatus getKeywordStatus(const LangOptions &LangOpts, unsigned Flags);
 
 enum class ReservedIdentifierStatus {
   NotReserved = 0,

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https://github.com/llvm/llvm-project/pull/165323