VectorICs: Remove --vector-stores flag.

src/ic/arm64/access-compiler-arm64.cc

Index: src/ic/arm64/access-compiler-arm64.cc
diff --git a/src/ic/arm64/access-compiler-arm64.cc b/src/ic/arm64/access-compiler-arm64.cc
index 13b0887a823292fec3009b32a56053507d81237b..892ce85dfbdc4a927ed2e9766ce1093426935b3d 100644
--- a/src/ic/arm64/access-compiler-arm64.cc
+++ b/src/ic/arm64/access-compiler-arm64.cc
@@ -38,7 +38,6 @@ Register* PropertyAccessCompiler::store_calling_convention() {
   // receiver, value, scratch1, scratch2, scratch3.
   Register receiver = StoreDescriptor::ReceiverRegister();
   Register name = StoreDescriptor::NameRegister();
-  DCHECK(FLAG_vector_stores || x3.is(StoreTransitionDescriptor::MapRegister()));
   static Register registers[] = {receiver, name, x3, x4, x5};
   return registers;
 }