Reland "Add DoubleTestOp instruction"

runtime/vm/intermediate_language_dbc.cc

Index: runtime/vm/intermediate_language_dbc.cc
diff --git a/runtime/vm/intermediate_language_dbc.cc b/runtime/vm/intermediate_language_dbc.cc
index 6bde28b910a1b0ca8d07a48d90e3fa2d30d87db5..26c8fec359560d12b6cbba63a99664059b5ff225 100644
--- a/runtime/vm/intermediate_language_dbc.cc
+++ b/runtime/vm/intermediate_language_dbc.cc
@@ -1649,6 +1649,23 @@ EMIT_NATIVE_CODE(BinaryDoubleOp, 2, Location::RequiresRegister()) {
 }
 
 
+EMIT_NATIVE_CODE(DoubleTestOp, 1, Location::RequiresRegister()) {
+  ASSERT(compiler->is_optimizing());
+  const Register value = locs()->in(0).reg();
+  const Register result = locs()->out(0).reg();
+  switch (op_kind()) {
+    case MethodRecognizer::kDouble_getIsNaN:
+      __ DoubleIsNaN(result, value);
+      break;
+    case MethodRecognizer::kDouble_getIsInfinite:
+      __ DoubleIsInfinite(result, value);
+      break;
+    default:
+      UNREACHABLE();
+  }
+}
+
+
 EMIT_NATIVE_CODE(UnaryDoubleOp, 1, Location::RequiresRegister()) {
   const Register value = locs()->in(0).reg();
   const Register result = locs()->out(0).reg();