[turbofan] Add the StackSlot operator to turbofan.

test/cctest/compiler/test-run-machops.cc

Index: test/cctest/compiler/test-run-machops.cc
diff --git a/test/cctest/compiler/test-run-machops.cc b/test/cctest/compiler/test-run-machops.cc
index 52672c8a89204cdf1fcc7d275311813bbeaf9a46..92d127680b8b7b4fa767c33ad5ff04c84c5b11ba 100644
--- a/test/cctest/compiler/test-run-machops.cc
+++ b/test/cctest/compiler/test-run-machops.cc
@@ -72,6 +72,20 @@ TEST(RunWord32Ctz) {
   CHECK_EQ(0, m.Call(uint32_t(0x9afdbc81)));
 }
 
+TEST(RunStackSlot) {

[titzer, 2016/01/28 09:02:18]

Can you write another test that tries the same for all machine types?

[ahaas, 2016/01/28 14:55:44]

Done.

+  BufferedRawMachineAssemblerTester<double> m;
+
+  Node* slot1 = m.StackSlot(MachineRepresentation::kFloat64);
+  Node* slot2 = m.StackSlot(MachineRepresentation::kWord32);
+
+  m.Store(MachineRepresentation::kFloat64, slot1, m.Float64Constant(2143.64543),
+          WriteBarrierKind::kNoWriteBarrier);
+  m.Store(MachineRepresentation::kWord32, slot2, m.Int32Constant(2143),
+          WriteBarrierKind::kNoWriteBarrier);
+  m.Return(m.Load(MachineType::Float64(), slot1));
+
+  CHECK_EQ(2143.64543, m.Call());
+}
 
 TEST(RunWord32Clz) {
   BufferedRawMachineAssemblerTester<int32_t> m(MachineType::Uint32());