Implement proper map checks of captured objects.

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 31a06df0820cdf375c8fc6f0a1a6186e5c189355..f3b577dcbf5721ad5f3bf0ee39e35bce03b600b8 100644
--- a/src/x64/lithium-x64.cc
+++ b/src/x64/lithium-x64.cc
@@ -1923,9 +1923,9 @@ LInstruction* LChunkBuilder::DoCheckInstanceType(HCheckInstanceType* instr) {
 }
 
 
-LInstruction* LChunkBuilder::DoCheckFunction(HCheckFunction* instr) {
+LInstruction* LChunkBuilder::DoCheckValue(HCheckValue* instr) {
   LOperand* value = UseRegisterAtStart(instr->value());
-  return AssignEnvironment(new(zone()) LCheckFunction(value));
+  return AssignEnvironment(new(zone()) LCheckValue(value));
 }