accel/tcg/plugin: Avoid duplicate copy in copy_call

We copied all of the arguments in copy_op_nocheck.
We only need to replace the one argument that we change.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

accel/tcg/plugin-gen.c

@@ -397,9 +397,7 @@ static TCGOp *copy_call(TCGOp **begin_op, TCGOp *op, void *empty_func,
 
     func_idx = TCGOP_CALLO(op) + TCGOP_CALLI(op);
     *cb_idx = func_idx;
-
     op->args[func_idx] = (uintptr_t)func;
-    op->args[func_idx + 1] = old_op->args[func_idx + 1];
 
     return op;
 }