`call_tir` initialize `out_sinfo` outside

Questions
2

Simpler example (cant edit the original post):

import tvm
from tvm.script import relax as R
from tvm.script import ir as I
from tvm.script import tir as T


@I.ir_module
class Module:
    @T.prim_func
    def dense_loop(CSR_VAL: T.handle, OUT: T.handle):
        csr_val = T.match_buffer(CSR_VAL, (8,), "float64")
        out = T.match_buffer(OUT, (8,), "float64")
        for i in T.serial(8):
            out[i] = csr_val[i] * 2.0

    @R.function
    def main(data: R.Tensor(("n",), dtype="float64")):
        cls = Module
        out = R.call_tir(cls.dense_loop, (data,), out_sinfo=R.Tensor((8,), dtype="float64"))
        return out

if __name__ == "__main__":
    ...
    ex = tvm.relax.build(Module, target="llvm")
    vm = tvm.relax.VirtualMachine(ex, tvm.cpu())
    data_arg = tvm.nd.array(csr_val, device=tvm.cpu())
    out = vm["main"](data_arg)
    ...