Use POLYMORPHIC for polymorphic Keyed(Load|Store)IC

src/arm/stub-cache-arm.cc

Index: src/arm/stub-cache-arm.cc
diff --git a/src/arm/stub-cache-arm.cc b/src/arm/stub-cache-arm.cc
index 9eab2d48336a57690b98e5d622818aa5286b5f49..dcc88f712d96e392a0142166b61123f201c0a22a 100644
--- a/src/arm/stub-cache-arm.cc
+++ b/src/arm/stub-cache-arm.cc
@@ -3327,7 +3327,7 @@ Handle<Code> KeyedLoadStubCompiler::CompileLoadPolymorphic(
   __ Jump(miss_ic, RelocInfo::CODE_TARGET, al);
 
   // Return the generated code.
-  return GetCode(Code::NORMAL, factory()->empty_string(), MEGAMORPHIC);
+  return GetCode(Code::NORMAL, factory()->empty_string(), POLYMORPHIC);
 }
 
 
@@ -3431,7 +3431,7 @@ Handle<Code> KeyedStoreStubCompiler::CompileStorePolymorphic(
   __ Jump(miss_ic, RelocInfo::CODE_TARGET, al);
 
   // Return the generated code.
-  return GetCode(Code::NORMAL, factory()->empty_string(), MEGAMORPHIC);
+  return GetCode(Code::NORMAL, factory()->empty_string(), POLYMORPHIC);
 }