Vector ICs: platform support for vector-based stores.

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

Index: src/ic/arm64/ic-compiler-arm64.cc
diff --git a/src/ic/arm64/ic-compiler-arm64.cc b/src/ic/arm64/ic-compiler-arm64.cc
index a86b5e53b5c26c047c227897ad3edd7259f79c03..b4a4163fed5bef9e2392de3c292604b34c13d5b1 100644
--- a/src/ic/arm64/ic-compiler-arm64.cc
+++ b/src/ic/arm64/ic-compiler-arm64.cc
@@ -116,7 +116,10 @@ Handle<Code> PropertyICCompiler::CompileKeyedStorePolymorphic(
       // This argument is used by the handler stub. For example, see
       // ElementsTransitionGenerator::GenerateMapChangeElementsTransition.
       Handle<WeakCell> cell = Map::WeakCellForMap(transitioned_maps->at(i));
-      __ LoadWeakValue(transition_map(), cell, &miss);
+      Register transition_map = scratch1();
+      DCHECK(!FLAG_vector_stores &&
+             transition_map.is(StoreTransitionDescriptor::MapRegister()));
+      __ LoadWeakValue(transition_map, cell, &miss);
     }
     __ Jump(handler_stubs->at(i), RelocInfo::CODE_TARGET);
     __ Bind(&skip);