luaK_codeABx
return luaK_codeABx(fs, OP_LOADK, reg, k);
int p = luaK_codeABx(fs, OP_LOADKX, reg, 0);
#define luaK_codeAsBx(fs,o,A,sBx) luaK_codeABx(fs,o,A,(sBx)+MAXARG_sBx)
LUAI_FUNC int luaK_codeABx (FuncState *fs, OpCode o, int A, unsigned int Bx);
init_exp(v, VRELOCABLE, luaK_codeABx(fs, OP_CLOSURE, 0, fs->np - 1));