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

src/hydrogen-instructions.h

Index: src/hydrogen-instructions.h
diff --git a/src/hydrogen-instructions.h b/src/hydrogen-instructions.h
index b524cfb2666383f454ca8dd42aadd51f07c1e0e8..191d86b47a44e24d920036d378cf81dd4e4fba4a 100644
--- a/src/hydrogen-instructions.h
+++ b/src/hydrogen-instructions.h
@@ -131,6 +131,7 @@ class LChunkBuilder;
   V(OsrEntry)                                 \
   V(Parameter)                                \
   V(Power)                                    \
+  V(Prologue)                                 \
   V(PushArguments)                            \
   V(RegExpLiteral)                            \
   V(Return)                                   \
@@ -1284,6 +1285,18 @@ class HDebugBreak final : public HTemplateInstruction<0> {
 };
 
 
+class HPrologue final : public HTemplateInstruction<0> {
+ public:
+  static HPrologue* New(Zone* zone) { return new (zone) HPrologue(); }
+
+  Representation RequiredInputRepresentation(int index) override {
+    return Representation::None();
+  }
+
+  DECLARE_CONCRETE_INSTRUCTION(Prologue)
+};
+
+
 class HGoto final : public HTemplateControlInstruction<1, 0> {
  public:
   explicit HGoto(HBasicBlock* target) {