Migrate instance of deprecated maps in HCheckMaps.

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 cc77d01838b1460e0925874647efcf992d83a9bc..a330f951d32fc6887d942f3e3e7ef4684d265c2f 100644
--- a/src/x64/lithium-x64.cc
+++ b/src/x64/lithium-x64.cc
@@ -1928,10 +1928,16 @@ LInstruction* LChunkBuilder::DoCheckFunction(HCheckFunction* instr) {
 
 LInstruction* LChunkBuilder::DoCheckMaps(HCheckMaps* instr) {
   LOperand* value = NULL;
-  if (!instr->CanOmitMapChecks()) value = UseRegisterAtStart(instr->value());
+  if (!instr->CanOmitMapChecks()) {
+    value = UseRegisterAtStart(instr->value());
+    if (instr->has_migration_target()) info()->MarkAsDeferredCalling();
+  }
   LCheckMaps* result = new(zone()) LCheckMaps(value);
-  if (instr->CanOmitMapChecks()) return result;
-  return AssignEnvironment(result);
+  if (!instr->CanOmitMapChecks()) {
+    AssignEnvironment(result);
+    if (instr->has_migration_target()) return AssignPointerMap(result);
+  }
+  return result;
 }