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

src/x64/lithium-x64.cc

Index: src/x64/lithium-x64.cc
diff --git a/src/x64/lithium-x64.cc b/src/x64/lithium-x64.cc
index 382c11ce8626d43817b539c7a20418b46104c83f..c8954ba2c68db6863539237c7f51815a36f8cfcf 100644
--- a/src/x64/lithium-x64.cc
+++ b/src/x64/lithium-x64.cc
@@ -938,7 +938,7 @@ void LChunkBuilder::AddInstruction(LInstruction* instr,
   }
   chunk_->AddInstruction(instr, current_block_);
 
-  if (instr->IsCall()) {
+  if (instr->IsCall() || instr->IsPrologue()) {
     HValue* hydrogen_value_for_lazy_bailout = hydrogen_val;
     if (hydrogen_val->HasObservableSideEffects()) {
       HSimulate* sim = HSimulate::cast(hydrogen_val->next());
@@ -957,6 +957,11 @@ LInstruction* LChunkBuilder::DoGoto(HGoto* instr) {
 }
 
 
+LInstruction* LChunkBuilder::DoPrologue(HPrologue* instr) {
+  return new (zone()) LPrologue();
+}
+
+
 LInstruction* LChunkBuilder::DoDebugBreak(HDebugBreak* instr) {
   return new(zone()) LDebugBreak();
 }