Reenable polymorphic getter inlining.

src/hydrogen.cc

Index: src/hydrogen.cc
diff --git a/src/hydrogen.cc b/src/hydrogen.cc
index 4e00ba6907fd60f59e25f0570c812b6727ad30ec..2d51b9b463941f072c2fc7f92b331eee66e80080 100644
--- a/src/hydrogen.cc
+++ b/src/hydrogen.cc
@@ -4711,7 +4711,7 @@ void HOptimizedGraphBuilder::HandlePolymorphicLoadNamedField(
       set_current_block(if_true);
 
       HInstruction* load = BuildLoadMonomorphic(
-          &info, object, compare, ast_id, return_id, false);
+          &info, object, compare, ast_id, return_id, FLAG_polymorphic_inlining);
       if (load == NULL) {
         if (HasStackOverflow()) return;
       } else {
@@ -4731,6 +4731,10 @@ void HOptimizedGraphBuilder::HandlePolymorphicLoadNamedField(
   // know about and do not want to handle ones we've never seen.  Otherwise
   // use a generic IC.
   if (count == types->length() && FLAG_deoptimize_uncommon_cases) {
+    // Because the deopt may be the only path in the polymorphic load, make sure
+    // that the environment stack matches the depth on deopt that it otherwise
+    // would have had after a successful load.
+    if (!ast_context()->IsEffect()) Push(graph()->GetConstant0());
     FinishExitWithHardDeoptimization("Unknown map in polymorphic load", join);
   } else {
     HValue* context = environment()->context();