X87: Encapsulate megamorphic load/tail-call in hydrogen

src/x87/lithium-x87.h

Index: src/x87/lithium-x87.h
diff --git a/src/x87/lithium-x87.h b/src/x87/lithium-x87.h
index e54ba023f83ce5ee0bfacee05466f7af2d4457be..316dee7786922bc6c63241b53ce5568831bff5fc 100644
--- a/src/x87/lithium-x87.h
+++ b/src/x87/lithium-x87.h
@@ -156,6 +156,7 @@ class LCodeGen;
   V(StringCompareAndBranch)                     \
   V(SubI)                                       \
   V(TaggedToI)                                  \
+  V(TailCallThroughMegamorphicCache)            \
   V(ThisFunction)                               \
   V(ToFastProperties)                           \
   V(TransitionElementsKind)                     \
@@ -496,6 +497,27 @@ class LCallStub FINAL : public LTemplateInstruction<1, 1, 0> {
 };
 
 
+class LTailCallThroughMegamorphicCache FINAL
+    : public LTemplateInstruction<0, 3, 0> {
+ public:
+  explicit LTailCallThroughMegamorphicCache(LOperand* context,
+                                            LOperand* receiver,
+                                            LOperand* name) {
+    inputs_[0] = context;
+    inputs_[1] = receiver;
+    inputs_[2] = name;
+  }
+
+  LOperand* context() { return inputs_[0]; }
+  LOperand* receiver() { return inputs_[1]; }
+  LOperand* name() { return inputs_[2]; }
+
+  DECLARE_CONCRETE_INSTRUCTION(TailCallThroughMegamorphicCache,
+                               "tail-call-through-megamorphic-cache")
+  DECLARE_HYDROGEN_ACCESSOR(TailCallThroughMegamorphicCache)
+};
+
+
 class LUnknownOSRValue FINAL : public LTemplateInstruction<1, 0, 0> {
  public:
   virtual bool HasInterestingComment(LCodeGen* gen) const OVERRIDE {
@@ -1909,9 +1931,10 @@ class LCallWithDescriptor FINAL : public LTemplateResultInstruction<1> {
 
   LOperand* target() const { return inputs_[0]; }
 
+  DECLARE_HYDROGEN_ACCESSOR(CallWithDescriptor)
+
  private:
   DECLARE_CONCRETE_INSTRUCTION(CallWithDescriptor, "call-with-descriptor")
-  DECLARE_HYDROGEN_ACCESSOR(CallWithDescriptor)
 
   virtual void PrintDataTo(StringStream* stream) OVERRIDE;