KOS_OP_BUILD_KWDS_NAMES
Style: CONST. Arg = constant pool index of names tuple.
Stack:
[..., v_0, ..., v_{n-1}] → [..., dict]. Pop n values, map names[i] → value[i], push dict. Names tuple from constant pool; values from stack (val_0 deepest, val_{n-1} at TOS).