For the outermost function needing a context frame, use the address of that frame as the nest argument instead of the address of a single-element list containing only that frame address. This saves some stack space and reduces memory accesses.

enum
{
    LLVMnone,
    LLVMintrinsic,
    LLVMno_typeinfo,
    LLVMno_moduleinfo,
    LLVMalloca,
    LLVMva_start,
    LLVMva_copy,
    LLVMva_end,
    LLVMva_arg,
    LLVMldc,
    LLVMinline_asm
};