Remove prototype checks for leaf maps in optimized code.

src/ia32/lithium-codegen-ia32.h

Index: src/ia32/lithium-codegen-ia32.h
diff --git a/src/ia32/lithium-codegen-ia32.h b/src/ia32/lithium-codegen-ia32.h
index 283430524c545eb39e22f7a6882f65e51bf2ef7b..6049257cbdf7e5a6704916376388c3e10f009852 100644
--- a/src/ia32/lithium-codegen-ia32.h
+++ b/src/ia32/lithium-codegen-ia32.h
@@ -57,6 +57,7 @@ class LCodeGen BASE_EMBEDDED {
         deoptimizations_(4, info->zone()),
         jump_table_(4, info->zone()),
         deoptimization_literals_(8, info->zone()),
+        prototype_maps_(0, info->zone()),
         inlined_function_count_(0),
         scope_(info->scope()),
         status_(UNUSED),
@@ -394,6 +395,7 @@ class LCodeGen BASE_EMBEDDED {
   ZoneList<LEnvironment*> deoptimizations_;
   ZoneList<JumpTableEntry> jump_table_;
   ZoneList<Handle<Object> > deoptimization_literals_;
+  ZoneList<Handle<Map> > prototype_maps_;
   int inlined_function_count_;
   Scope* const scope_;
   Status status_;