Always include debugger support.

src/assembler.h

Index: src/assembler.h
diff --git a/src/assembler.h b/src/assembler.h
index 2742032b16dd16bbad2fdf3a2a69c72851332d45..e9eb2023570e9610cf5ed2822b80677692cd536c 100644
--- a/src/assembler.h
+++ b/src/assembler.h
@@ -669,9 +669,7 @@ class RelocIterator: public Malloced {
 //----------------------------------------------------------------------------
 class IC_Utility;
 class SCTableReference;
-#ifdef ENABLE_DEBUGGER_SUPPORT
 class Debug_Address;
-#endif
 
 
 // An ExternalReference represents a C++ address used in the generated
@@ -741,9 +739,7 @@ class ExternalReference BASE_EMBEDDED {
 
   ExternalReference(const IC_Utility& ic_utility, Isolate* isolate);
 
-#ifdef ENABLE_DEBUGGER_SUPPORT
   ExternalReference(const Debug_Address& debug_address, Isolate* isolate);
-#endif
 
   explicit ExternalReference(StatsCounter* counter);
 
@@ -866,13 +862,11 @@ class ExternalReference BASE_EMBEDDED {
 
   Address address() const { return reinterpret_cast<Address>(address_); }
 
-#ifdef ENABLE_DEBUGGER_SUPPORT
   // Function Debug::Break()
   static ExternalReference debug_break(Isolate* isolate);
 
   // Used to check if single stepping is enabled in generated code.
   static ExternalReference debug_step_in_fp_address(Isolate* isolate);
-#endif
 
 #ifndef V8_INTERPRETED_REGEXP
   // C functions called from RegExp generated code.