Crankshaft is now able to compile top level code even if there is a ScriptContext.

src/utils.h

Index: src/utils.h
diff --git a/src/utils.h b/src/utils.h
index 822b4b2e1edfea7c79a2d3566ab3f7b98de9e082..ef35f9696489678a74a7dcc33793343f00193eb4 100644
--- a/src/utils.h
+++ b/src/utils.h
@@ -1084,6 +1084,7 @@ class BailoutId {
   int ToInt() const { return id_; }
 
   static BailoutId None() { return BailoutId(kNoneId); }
+  static BailoutId Prologue() { return BailoutId(kPrologueId); }
   static BailoutId FunctionEntry() { return BailoutId(kFunctionEntryId); }
   static BailoutId Declarations() { return BailoutId(kDeclarationsId); }
   static BailoutId FirstUsable() { return BailoutId(kFirstUsableId); }
@@ -1099,6 +1100,7 @@ class BailoutId {
   static const int kNoneId = -1;
 
   // Using 0 could disguise errors.
+  static const int kPrologueId = 1;
   static const int kFunctionEntryId = 2;
 
   // This AST id identifies the point after the declarations have been visited.