X87: Reland Vector ICs: platform support for vector-based stores.

src/ic/x87/access-compiler-x87.cc

Index: src/ic/x87/access-compiler-x87.cc
diff --git a/src/ic/x87/access-compiler-x87.cc b/src/ic/x87/access-compiler-x87.cc
index bdcbb166b91e4e6495603b0d94893d10b8487a7c..a80c649e451115db8afc66fb75d01938875be212 100644
--- a/src/ic/x87/access-compiler-x87.cc
+++ b/src/ic/x87/access-compiler-x87.cc
@@ -30,7 +30,8 @@ Register* PropertyAccessCompiler::store_calling_convention() {
   // receiver, name, scratch1, scratch2, scratch3.
   Register receiver = StoreDescriptor::ReceiverRegister();
   Register name = StoreDescriptor::NameRegister();
-  DCHECK(ebx.is(StoreTransitionDescriptor::MapRegister()));
+  DCHECK(FLAG_vector_stores ||
+         ebx.is(StoreTransitionDescriptor::MapRegister()));
   static Register registers[] = {receiver, name, ebx, edi, no_reg};
   return registers;
 }