Remove unnecessary explicity prototype check.

src/ia32/stub-cache-ia32.cc

Index: src/ia32/stub-cache-ia32.cc
diff --git a/src/ia32/stub-cache-ia32.cc b/src/ia32/stub-cache-ia32.cc
index fbe33510c16967df7c703be55d57dd3b2d1d192d..fcc06fada7fa2886125a5db80bdb1d1d5cfee12a 100644
--- a/src/ia32/stub-cache-ia32.cc
+++ b/src/ia32/stub-cache-ia32.cc
@@ -1113,7 +1113,7 @@ void BaseLoadStubCompiler::NonexistentHandlerFrontend(
     Handle<GlobalObject> global) {
   Label miss;
 
-  Register reg = HandlerFrontendHeader(object, receiver(), last, name, &miss);
+  HandlerFrontendHeader(object, receiver(), last, name, &miss);
 
   // If the last object in the prototype chain is a global object,
   // check that the global property cell is empty.
@@ -1121,13 +1121,6 @@ void BaseLoadStubCompiler::NonexistentHandlerFrontend(
     GenerateCheckPropertyCell(masm(), global, name, scratch2(), &miss);
   }
 
-  if (!last->HasFastProperties()) {
-    __ mov(scratch2(), FieldOperand(reg, HeapObject::kMapOffset));
-    __ mov(scratch2(), FieldOperand(scratch2(), Map::kPrototypeOffset));
-    __ cmp(scratch2(), isolate()->factory()->null_value());
-    __ j(not_equal, &miss);
-  }
-
   HandlerFrontendFooter(success, &miss);
 }