Also support smi in load-ICs.

src/x64/stub-cache-x64.cc

Index: src/x64/stub-cache-x64.cc
diff --git a/src/x64/stub-cache-x64.cc b/src/x64/stub-cache-x64.cc
index b4222bc82f4ae9271ead55dc8c4d92b19ba4febe..3a1a1792d0a87409c554146e70ee95560929522b 100644
--- a/src/x64/stub-cache-x64.cc
+++ b/src/x64/stub-cache-x64.cc
@@ -3071,17 +3071,25 @@ Handle<Code> BaseLoadStoreStubCompiler::CompilePolymorphicIC(
     GenerateNameCheck(name, this->name(), &miss);
   }
 
-  __ JumpIfSmi(receiver(), &miss);
+  Label number_case;
+  Label* smi_target = HasHeapNumberMap(receiver_maps) ? &number_case : &miss;
+  __ JumpIfSmi(receiver(), smi_target);
+
   Register map_reg = scratch1();
   __ movq(map_reg, FieldOperand(receiver(), HeapObject::kMapOffset));
   int receiver_count = receiver_maps->length();
   int number_of_handled_maps = 0;
+  Handle<Map> heap_number_map = isolate()->factory()->heap_number_map();
   for (int current = 0; current < receiver_count; ++current) {
     Handle<Map> map = receiver_maps->at(current);
     if (!map->is_deprecated()) {
       number_of_handled_maps++;
       // Check map and tail call if there's a match
       __ Cmp(map_reg, receiver_maps->at(current));
+      if (map.is_identical_to(heap_number_map)) {
+        ASSERT(!number_case.is_unused());
+        __ bind(&number_case);
+      }
       __ j(equal, handlers->at(current), RelocInfo::CODE_TARGET);
     }
   }