[crankshaft] Support inlining of function calls in tail position (in ES6 sense).

src/crankshaft/lithium-codegen.cc

Index: src/crankshaft/lithium-codegen.cc
diff --git a/src/crankshaft/lithium-codegen.cc b/src/crankshaft/lithium-codegen.cc
index ff4e78f6a7aab863bb206b0fe847f085549bf6b9..53fedcf1df1d9de4abdd3f19d5f35ed48381d2b3 100644
--- a/src/crankshaft/lithium-codegen.cc
+++ b/src/crankshaft/lithium-codegen.cc
@@ -240,8 +240,8 @@ void LCodeGenBase::WriteTranslationFrame(LEnvironment* environment,
       break;
     }
     case JS_GETTER: {
-      DCHECK(translation_size == 1);
-      DCHECK(height == 0);
+      DCHECK_EQ(1, translation_size);
+      DCHECK_EQ(0, height);
       int shared_id = DefineDeoptimizationLiteral(
           environment->entry() ? environment->entry()->shared()
                                : info()->shared_info());
@@ -255,8 +255,8 @@ void LCodeGenBase::WriteTranslationFrame(LEnvironment* environment,
       break;
     }
     case JS_SETTER: {
-      DCHECK(translation_size == 2);
-      DCHECK(height == 0);
+      DCHECK_EQ(2, translation_size);
+      DCHECK_EQ(0, height);
       int shared_id = DefineDeoptimizationLiteral(
           environment->entry() ? environment->entry()->shared()
                                : info()->shared_info());
@@ -269,6 +269,20 @@ void LCodeGenBase::WriteTranslationFrame(LEnvironment* environment,
       }
       break;
     }
+    case TAIL_CALLER_FUNCTION: {
+      DCHECK_EQ(0, translation_size);
+      int shared_id = DefineDeoptimizationLiteral(
+          environment->entry() ? environment->entry()->shared()
+                               : info()->shared_info());
+      translation->BeginTailCallerFrame(shared_id);
+      if (info()->closure().is_identical_to(environment->closure())) {
+        translation->StoreJSFrameFunction();
+      } else {
+        int closure_id = DefineDeoptimizationLiteral(environment->closure());
+        translation->StoreLiteral(closure_id);
+      }
+      break;
+    }
     case ARGUMENTS_ADAPTOR: {
       int shared_id = DefineDeoptimizationLiteral(
           environment->entry() ? environment->entry()->shared()