[api] Add a switch that controls if ES2015 tail call elimination feature is enabled or not.

src/isolate.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_ISOLATE_H_
 #define V8_ISOLATE_H_
 
 #include <queue>
 #include <set>
 
@@ skipping 1078 matching lines @@
   int GetNextUniqueSharedFunctionInfoId() { return next_unique_sfi_id_++; }
 #endif
 
   // Support for dynamically disabling tail call elimination.
   Address is_tail_call_elimination_enabled_address() {
     return reinterpret_cast<Address>(&is_tail_call_elimination_enabled_);
   }
   bool is_tail_call_elimination_enabled() const {
     return is_tail_call_elimination_enabled_;
   }
-  void set_tail_call_elimination_enabled(bool enabled) {
-    is_tail_call_elimination_enabled_ = enabled;
-  }
+  void SetTailCallEliminationEnabled(bool enabled);
 
   void AddDetachedContext(Handle<Context> context);
   void CheckDetachedContextsAfterGC();
 
   List<Object*>* partial_snapshot_cache() { return &partial_snapshot_cache_; }
 
   void set_array_buffer_allocator(v8::ArrayBuffer::Allocator* allocator) {
     array_buffer_allocator_ = allocator;
   }
   v8::ArrayBuffer::Allocator* array_buffer_allocator() const {
@@ skipping 483 matching lines @@
 
   EmbeddedVector<char, 128> filename_;
   FILE* file_;
   int scope_depth_;
 };
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_ISOLATE_H_