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

src/x64/lithium-x64.h

Index: src/x64/lithium-x64.h
diff --git a/src/x64/lithium-x64.h b/src/x64/lithium-x64.h
index e66acc0b647c93562a56a9264f287419bdffc199..c46f5ac703224207cb2e0b8fd0edeceaf96abc0c 100644
--- a/src/x64/lithium-x64.h
+++ b/src/x64/lithium-x64.h
@@ -129,6 +129,7 @@ class LCodeGen;
   V(OsrEntry)                                \
   V(Parameter)                               \
   V(Power)                                   \
+  V(Prologue)                                \
   V(PushArgument)                            \
   V(RegExpLiteral)                           \
   V(Return)                                  \
@@ -393,6 +394,12 @@ 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:
   LLazyBailout() : gap_instructions_size_(0) { }