[LowerToHW] Failure when lowering bundle_create which contains zero bit

[uenoku]

  firrtl.circuit "top" {
  firrtl.module @top(in %in: !firrtl.bundle<foo: uint<0>, t: uint<8>>, out %out: !firrtl.bundle<foo: uint<0>, t: uint<8>>) {
    %c0_ui0 = firrtl.constant 0 : !firrtl.uint<0>
    %0 = firrtl.subfield %in[t] : !firrtl.bundle<foo: uint<0>, t: uint<8>>
    %1 = firrtl.bundlecreate %c0_ui0, %0 : (!firrtl.uint<0>, !firrtl.uint<8>) -> !firrtl.bundle<foo: uint<0>, t: uint<8>>
    firrtl.matchingconnect %out, %1 : !firrtl.bundle<foo: uint<0>, t: uint<8>>
  }
  }

bar.fir:16:13: error: 'firrtl.bundlecreate' op LowerToHW couldn't handle this operation
    out.foo <= UInt<1>(0)
            ^
bar.fir:16:13: note: see current operation: %4 = "firrtl.bundlecreate"(%1, %3) : (!firrtl.uint<0>, !firrtl.uint<8>) -> !firrtl.bundle<foo: uint<0>, t: uint<8>>
bar.fir:15:11: note: additional location here
    out.t <= in.t