Merge arguments branch to bleeding merge.

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 7b652d30f58fbde0da9b53b37f7822031923f184..0009f15a265b7c505090c803f7c1fa0d63f9674b 100644
--- a/src/arm/stub-cache-arm.cc
+++ b/src/arm/stub-cache-arm.cc
@@ -3429,6 +3429,7 @@ static bool IsElementTypeSigned(JSObject::ElementsKind elements_kind) {
     case JSObject::FAST_ELEMENTS:
     case JSObject::FAST_DOUBLE_ELEMENTS:
     case JSObject::DICTIONARY_ELEMENTS:
+    case JSObject::NON_STRICT_ARGUMENTS_ELEMENTS:
       UNREACHABLE();
       return false;
   }
@@ -3514,6 +3515,7 @@ void KeyedLoadStubCompiler::GenerateLoadExternalArray(
     case JSObject::FAST_ELEMENTS:
     case JSObject::FAST_DOUBLE_ELEMENTS:
     case JSObject::DICTIONARY_ELEMENTS:
+    case JSObject::NON_STRICT_ARGUMENTS_ELEMENTS:
       UNREACHABLE();
       break;
   }
@@ -3855,6 +3857,7 @@ void KeyedStoreStubCompiler::GenerateStoreExternalArray(
     case JSObject::FAST_ELEMENTS:
     case JSObject::FAST_DOUBLE_ELEMENTS:
     case JSObject::DICTIONARY_ELEMENTS:
+    case JSObject::NON_STRICT_ARGUMENTS_ELEMENTS:
       UNREACHABLE();
       break;
   }
@@ -3919,6 +3922,7 @@ void KeyedStoreStubCompiler::GenerateStoreExternalArray(
           case JSObject::FAST_ELEMENTS:
           case JSObject::FAST_DOUBLE_ELEMENTS:
           case JSObject::DICTIONARY_ELEMENTS:
+          case JSObject::NON_STRICT_ARGUMENTS_ELEMENTS:
             UNREACHABLE();
             break;
         }
@@ -4057,6 +4061,7 @@ void KeyedStoreStubCompiler::GenerateStoreExternalArray(
           case JSObject::FAST_ELEMENTS:
           case JSObject::FAST_DOUBLE_ELEMENTS:
           case JSObject::DICTIONARY_ELEMENTS:
+          case JSObject::NON_STRICT_ARGUMENTS_ELEMENTS:
             UNREACHABLE();
             break;
         }