Proof of concept: API for doing only one parsing pass instead of first preparsing and then parsing.

src/compiler.h

Index: src/compiler.h
diff --git a/src/compiler.h b/src/compiler.h
index e4ade7b97a04eed0248126a084810854e39935f2..405cfb2512ecf0a0905c180e80dd8a1c9f21db70 100644
--- a/src/compiler.h
+++ b/src/compiler.h
@@ -77,7 +77,7 @@ class CompilationInfo {
   Handle<Script> script() const { return script_; }
   HydrogenCodeStub* code_stub() const {return code_stub_; }
   v8::Extension* extension() const { return extension_; }
-  ScriptDataImpl* pre_parse_data() const { return pre_parse_data_; }
+  ScriptDataImpl** cached_data() const { return cached_data_; }
   Handle<Context> context() const { return context_; }
   BailoutId osr_ast_id() const { return osr_ast_id_; }
   Handle<Code> unoptimized_code() const { return unoptimized_code_; }
@@ -183,9 +183,9 @@ class CompilationInfo {
     ASSERT(!is_lazy());
     extension_ = extension;
   }
-  void SetPreParseData(ScriptDataImpl* pre_parse_data) {
+  void SetCachedData(ScriptDataImpl** cached_data) {
     ASSERT(!is_lazy());
-    pre_parse_data_ = pre_parse_data;
+    cached_data_ = cached_data;
   }
   void SetContext(Handle<Context> context) {
     context_ = context;
@@ -400,7 +400,7 @@ class CompilationInfo {
 
   // Fields possibly needed for eager compilation, NULL by default.
   v8::Extension* extension_;
-  ScriptDataImpl* pre_parse_data_;
+  ScriptDataImpl** cached_data_;
 
   // The context of the caller for eval code, and the global context for a
   // global script. Will be a null handle otherwise.
@@ -630,7 +630,7 @@ class Compiler : public AllStatic {
                                                   bool is_shared_cross_origin,
                                                   Handle<Context> context,
                                                   v8::Extension* extension,
-                                                  ScriptDataImpl* pre_data,
+                                                  ScriptDataImpl** pre_data,
                                                   NativesFlag is_natives_code);
 
   // Create a shared function info object (the code may be lazily compiled).