[turbofan] Support for %_DoubleHi, %_DoubleLo and %_ConstructDouble.

test/unittests/compiler/machine-operator-reducer-unittest.cc

Index: test/unittests/compiler/machine-operator-reducer-unittest.cc
diff --git a/test/unittests/compiler/machine-operator-reducer-unittest.cc b/test/unittests/compiler/machine-operator-reducer-unittest.cc
index e41b01506117dced5c7bd1db8cbb11c9736ae961..5a986e87eea172578fc426b521ed947ace54e98a 100644
--- a/test/unittests/compiler/machine-operator-reducer-unittest.cc
+++ b/test/unittests/compiler/machine-operator-reducer-unittest.cc
@@ -1436,6 +1436,28 @@ TEST_F(MachineOperatorReducerTest, Float64MulWithMinusOne) {
 
 
 // -----------------------------------------------------------------------------
+// Float64InsertWord32
+
+
+TEST_F(MachineOperatorReducerTest, Float64InsertWord32WithConstant) {
+  TRACED_FOREACH(double, x, kFloat64Values) {
+    TRACED_FOREACH(uint32_t, y, kUint32Values) {
+      TRACED_FORRANGE(int, location, 0, 1) {
+        Reduction const r =
+            Reduce(graph()->NewNode(machine()->Float64InsertWord32(location),
+                                    Float64Constant(x), Uint32Constant(y)));
+        ASSERT_TRUE(r.Changed());
+        EXPECT_THAT(r.replacement(),
+                    IsFloat64Constant(
+                        BitEq(bit_cast<double>(base::bits::InsertElement64(
+                            bit_cast<uint64_t>(x), y, location)))));
+      }
+    }
+  }
+}
+
+
+// -----------------------------------------------------------------------------
 // Store