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

src/hydrogen-instructions.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_HYDROGEN_INSTRUCTIONS_H_
 #define V8_HYDROGEN_INSTRUCTIONS_H_
 
 #include <cstring>
 #include <iosfwd>
 
@@ skipping 113 matching lines @@
   V(LoadRoot)                                 \
   V(MapEnumLength)                            \
   V(MathFloorOfDiv)                           \
   V(MathMinMax)                               \
   V(MaybeGrowElements)                        \
   V(Mod)                                      \
   V(Mul)                                      \
   V(OsrEntry)                                 \
   V(Parameter)                                \
   V(Power)                                    \
+  V(Prologue)                                 \
   V(PushArguments)                            \
   V(RegExpLiteral)                            \
   V(Return)                                   \
   V(Ror)                                      \
   V(Sar)                                      \
   V(SeqStringGetChar)                         \
   V(SeqStringSetChar)                         \
   V(Shl)                                      \
   V(Shr)                                      \
   V(Simulate)                                 \
@@ skipping 1133 matching lines @@
   DECLARE_INSTRUCTION_FACTORY_P0(HDebugBreak);
 
   Representation RequiredInputRepresentation(int index) override {
     return Representation::None();
   }
 
   DECLARE_CONCRETE_INSTRUCTION(DebugBreak)
 };
 
 
+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) {
     SetSuccessorAt(0, target);
   }
 
   bool KnownSuccessorBlock(HBasicBlock** block) override {
     *block = FirstSuccessor();
     return true;
   }
@@ skipping 6739 matching lines @@
 };
 
 
 
 #undef DECLARE_INSTRUCTION
 #undef DECLARE_CONCRETE_INSTRUCTION
 
 } }  // namespace v8::internal
 
 #endif  // V8_HYDROGEN_INSTRUCTIONS_H_