Encapsulate megamorphic load/tail-call in hydrogen

src/ic/stub-cache.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_STUB_CACHE_H_
 #define V8_STUB_CACHE_H_
 
 #include "src/macro-assembler.h"
 
 namespace v8 {
@@ skipping 33 matching lines @@
   Code* Get(Name* name, Map* map, Code::Flags flags);
   // Clear the lookup table (@ mark compact collection).
   void Clear();
   // Collect all maps that match the name and flags.
   void CollectMatchingMaps(SmallMapList* types, Handle<Name> name,
                            Code::Flags flags, Handle<Context> native_context,
                            Zone* zone);
   // Generate code for probing the stub cache table.
   // Arguments extra, extra2 and extra3 may be used to pass additional scratch
   // registers. Set to no_reg if not needed.
-  void GenerateProbe(MacroAssembler* masm, Code::Flags flags, Register receiver,
-                     Register name, Register scratch, Register extra,
-                     Register extra2 = no_reg, Register extra3 = no_reg);
+  // If leave_frame is true, then exit a frame before the tail call.
+  void GenerateProbe(MacroAssembler* masm, Code::Flags flags, bool leave_frame,
+                     Register receiver, Register name, Register scratch,
+                     Register extra, Register extra2 = no_reg,
+                     Register extra3 = no_reg);
 
   enum Table { kPrimary, kSecondary };
 
   SCTableReference key_reference(StubCache::Table table) {
     return SCTableReference(
         reinterpret_cast<Address>(&first_entry(table)->key));
   }
 
   SCTableReference map_reference(StubCache::Table table) {
     return SCTableReference(
@@ skipping 79 matching lines @@
     const int multiplier = sizeof(*table) >> Name::kHashShift;
     return reinterpret_cast<Entry*>(reinterpret_cast<Address>(table) +
                                     offset * multiplier);
   }
 
   static const int kPrimaryTableBits = 11;
   static const int kPrimaryTableSize = (1 << kPrimaryTableBits);
   static const int kSecondaryTableBits = 9;
   static const int kSecondaryTableSize = (1 << kSecondaryTableBits);
 
+ private:
   Entry primary_[kPrimaryTableSize];
   Entry secondary_[kSecondaryTableSize];
   Isolate* isolate_;
 
   friend class Isolate;
   friend class SCTableReference;
 
   DISALLOW_COPY_AND_ASSIGN(StubCache);
 };
 }
 }  // namespace v8::internal
 
 #endif  // V8_STUB_CACHE_H_