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

src/ia32/lithium-ia32.h

Index: src/ia32/lithium-ia32.h
diff --git a/src/ia32/lithium-ia32.h b/src/ia32/lithium-ia32.h
index 04634a3236c9a8b98b5b7206899c6bf80b91fe09..8c7e28c2d2b3bd1db3433874b68547e1ba27dfda 100644
--- a/src/ia32/lithium-ia32.h
+++ b/src/ia32/lithium-ia32.h
@@ -133,6 +133,7 @@ class LCodeGen;
   V(OsrEntry)                                \
   V(Parameter)                               \
   V(Power)                                   \
+  V(Prologue)                                \
   V(PushArgument)                            \
   V(RegExpLiteral)                           \
   V(Return)                                  \
@@ -394,6 +395,12 @@ class LGoto final : public LTemplateInstruction<0, 0, 0> {
 };
 
 
+class LPrologue final : public LTemplateInstruction<0, 0, 0> {
+ public:
+  DECLARE_CONCRETE_INSTRUCTION(Prologue, "prologue")
+};
+
+
 class LLazyBailout final : public LTemplateInstruction<0, 0, 0> {
  public:
   DECLARE_CONCRETE_INSTRUCTION(LazyBailout, "lazy-bailout")