Revert "Add DoubleTestOp instruction"

runtime/vm/flow_graph_type_propagator.cc

Index: runtime/vm/flow_graph_type_propagator.cc
diff --git a/runtime/vm/flow_graph_type_propagator.cc b/runtime/vm/flow_graph_type_propagator.cc
index 4b9537526544681680dece9ccf6d95d05e5013cc..d0dd61b37f2dd333fc54cb80eecabf9e6c72fb4c 100644
--- a/runtime/vm/flow_graph_type_propagator.cc
+++ b/runtime/vm/flow_graph_type_propagator.cc
@@ -1152,11 +1152,6 @@ CompileType BinaryDoubleOpInstr::ComputeType() const {
 }
 
 
-CompileType DoubleTestOpInstr::ComputeType() const {
-  return CompileType::FromCid(kBoolCid);
-}
-
-
 CompileType BinaryFloat32x4OpInstr::ComputeType() const {
   return CompileType::FromCid(kFloat32x4Cid);
 }