[NFC][clang][Serialization] Batch serialized LangOptions values (#202844) Collect fixed language-option and sanitizer values in a `uint64_t` local array and append the array to the control-block record once. Generated values retain their serialized order. Linked `clang` and `clangd` shrink by 91,584 and 91,520 bytes respectively; `ASTWriter.cpp.o` shrinks by 25,128 bytes with 396 fewer relocations, while linked fixups are unchanged. Work towards #202616 AI tool disclosure: Co-authored with OpenAI Codex.
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