message: Fix elementwise broadcast test
diff: @@ -83,8 +83,8 @@ HloModule top
  ENTRY c1 {
  p0 = f16[1,16,16,4] parameter(0)
  - c1 = f16[4] constant({1, 2, 3, 4})
  - bcast = f16[1,16,16,4] broadcast(c1), dimensions={3}
  + c1 = f16[] constant(1)
  + bcast = f16[1,16,16,4] broadcast(c1), dimensions={}
  ROOT %divide = f16[1,16,16,4] divide(p0, bcast)
  }
  )";
  @@ -97,8 +97,6 @@ ENTRY c1 {
  auto* root = module0->entry_computation()->root_instruction();
  auto opcode = root->opcode();
  - const auto* bcast = root->operand(1);
  - const auto* c1 = bcast->operand(0);
  const auto* p0 = root->operand(0);
  ElementwiseBroadcastConverter ebc;
  @@ -140,8 +138,6 @@ ENTRY c1 {
  auto* root = module0->entry_computation()->root_instruction();
  auto opcode = root->opcode();
  - const auto* bcast = root->operand(1);
  - const auto* c1 = bcast->operand(0);
  const auto* p0 = root->operand(0);
  ElementwiseBroadcastConverter ebc;
  @@ -228,8 +224,6 @@ ENTRY c1 {
  auto* root = module0->entry_computation()->root_instruction();
  auto opcode = root->opcode();
  - const auto* bcast = root->operand(0);
  - const auto* c0 = bcast->operand(0);
  const auto* p1 = root->operand(1);
  ElementwiseBroadcastConverter ebc;
  @@ -325,8 +319,6 @@ ENTRY c1 {
  auto* root = module0->entry_computation()->root_instruction();
  auto opcode = root->opcode();
  const auto* p0 = root->operand(0);
  - const auto* bcast1 = root->operand(1);
  - const auto* c1 = bcast1->operand(0);
  const auto* bcast2 = root->operand(2);
  const auto* p2 = bcast2->operand(0);
  