{"ast_node_type":"other","tokens":[{"end":68,"kind":"keyword","start":0,"text":"\"llvm.x86.avx2.gather.d.d\""}]}
        "llvm.x86.avx2.gather.d.d" => "__builtin_ia32_gathersiv4si",
        // The above doc points to unknown builtins for the following, so override them:
        "llvm.x86.avx2.gather.d.d.256" => "__builtin_ia32_gathersiv8si",