Use the virtual-frame based optimizing compiler for split-compilation...

src/x64/codegen-x64.h

Index: src/x64/codegen-x64.h
===================================================================
--- src/x64/codegen-x64.h	(revision 3775)
+++ src/x64/codegen-x64.h	(working copy)
@@ -294,6 +294,15 @@
 
 class CodeGenerator: public AstVisitor {
  public:
+  // Compilation mode.  Either the compiler is used as the primary
+  // compiler and needs to setup everything or the compiler is used as
+  // the secondary compiler for split compilation and has to handle
+  // bailouts.
+  enum Mode {
+    PRIMARY,
+    SECONDARY
+  };
+
   // Takes a function literal, generates code for it. This function should only
   // be called by compiler.cc.
   static Handle<Code> MakeCode(FunctionLiteral* fun,
@@ -381,7 +390,7 @@
   void VisitStatementsAndSpill(ZoneList<Statement*>* statements);
 
   // Main code generation function
-  void GenCode(FunctionLiteral* fun, CompilationInfo* info);
+  void Generate(FunctionLiteral* fun, Mode mode, CompilationInfo* info);
 
   // Generate the return sequence code.  Should be called no more than
   // once per compiled function, immediately after binding the return