[interpreter] Add Interpreter{Entry,Exit}Trampoline builtins.

test/unittests/compiler/interpreter-assembler-unittest.cc

Index: test/unittests/compiler/interpreter-assembler-unittest.cc
diff --git a/test/unittests/compiler/interpreter-assembler-unittest.cc b/test/unittests/compiler/interpreter-assembler-unittest.cc
index 7bc91ce994e2698ae7fe854ff6f73dc50eef9ca9..b6955d99162a72bf8fa9ba488d8f36974f956159 100644
--- a/test/unittests/compiler/interpreter-assembler-unittest.cc
+++ b/test/unittests/compiler/interpreter-assembler-unittest.cc
@@ -6,6 +6,7 @@
 
 #include "src/compiler/graph.h"
 #include "src/compiler/node.h"
+#include "src/unique.h"
 #include "test/unittests/compiler/compiler-test-utils.h"
 #include "test/unittests/compiler/node-test-utils.h"
 
@@ -86,6 +87,32 @@ TARGET_TEST_F(InterpreterAssemblerTest, Dispatch) {
 }
 
 
+TARGET_TEST_F(InterpreterAssemblerTest, Return) {
+  TRACED_FOREACH(interpreter::Bytecode, bytecode, kBytecodes) {
+    InterpreterAssemblerForTest m(this, bytecode);
+    m.Return();
+    Graph* graph = m.GetCompletedGraph();
+
+    Node* end = graph->end();
+    EXPECT_EQ(1, end->InputCount());
+    Node* tail_call_node = end->InputAt(0);
+
+    EXPECT_EQ(CallDescriptor::kInterpreterDispatch,
+              m.call_descriptor()->kind());
+    Matcher<Unique<HeapObject>> exit_trampoline(
+        Unique<HeapObject>::CreateImmovable(
+            isolate()->builtins()->InterpreterExitTrampoline()));
+    EXPECT_THAT(
+        tail_call_node,
+        IsTailCall(m.call_descriptor(), IsHeapConstant(exit_trampoline),
+                   IsParameter(Linkage::kInterpreterBytecodeOffsetParameter),
+                   IsParameter(Linkage::kInterpreterBytecodeArrayParameter),
+                   IsParameter(Linkage::kInterpreterDispatchTableParameter),
+                   graph->start(), graph->start()));
+  }
+}
+
+
 TARGET_TEST_F(InterpreterAssemblerTest, BytecodeArg) {
   TRACED_FOREACH(interpreter::Bytecode, bytecode, kBytecodes) {
     InterpreterAssemblerForTest m(this, bytecode);