Update V8 to r5675 as required by WebKit r70209

Change-Id: Ib10adb470d41ca8c109ead5fc893b880e18d489f
diff --git a/src/x64/codegen-x64.h b/src/x64/codegen-x64.h
index 6e1dd72..7957324 100644
--- a/src/x64/codegen-x64.h
+++ b/src/x64/codegen-x64.h
@@ -298,9 +298,7 @@
 
 class CodeGenerator: public AstVisitor {
  public:
-  // Takes a function literal, generates code for it. This function should only
-  // be called by compiler.cc.
-  static Handle<Code> MakeCode(CompilationInfo* info);
+  static bool MakeCode(CompilationInfo* info);
 
   // Printing of AST, etc. as requested by flags.
   static void MakeCodePrologue(CompilationInfo* info);
@@ -586,9 +584,6 @@
 
   void CheckStack();
 
-  static InlineFunctionGenerator FindInlineFunctionGenerator(
-      Runtime::FunctionId function_id);
-
   bool CheckForInlineRuntimeCall(CallRuntime* node);
 
   void ProcessDeclarations(ZoneList<Declaration*>* declarations);