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

src/arm64/lithium-arm64.h

Index: src/arm64/lithium-arm64.h
diff --git a/src/arm64/lithium-arm64.h b/src/arm64/lithium-arm64.h
index bdc622c4e3759460d8e02c783cc3fecf7fd93600..159e60cc542644a4bd6c36997af18d92e2914134 100644
--- a/src/arm64/lithium-arm64.h
+++ b/src/arm64/lithium-arm64.h
@@ -138,6 +138,7 @@ class LCodeGen;
   V(OsrEntry)                                \
   V(Parameter)                               \
   V(Power)                                   \
+  V(Prologue)                                \
   V(PreparePushArguments)                    \
   V(PushArguments)                           \
   V(RegExpLiteral)                           \
@@ -473,6 +474,12 @@ 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) { }