[clangd] Avoid libFormat's objective-c guessing heuristic where possible (#84133) This avoids a known libFormat bug where the heuristic can OOM on certain large files (particularly single-header libraries such as miniaudio.h). The OOM will still happen on affected files if you actually try to format them (this is harder to avoid since the underlyting issue affects the actual formatting logic, not just the language-guessing heuristic), but at least it's avoided during non-modifying operations like hover, and modifying operations that do local formatting like code completion. Fixes https://github.com/clangd/clangd/issues/719 Fixes https://github.com/clangd/clangd/issues/1384 Fixes https://github.com/llvm/llvm-project/issues/70945
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