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

src/ic/mips64/access-compiler-mips64.cc

Index: src/ic/mips64/access-compiler-mips64.cc
diff --git a/src/ic/mips64/access-compiler-mips64.cc b/src/ic/mips64/access-compiler-mips64.cc
index a2e7aed4dc18e9c5edbfe835acd546c9cfa84788..500a6d65c743d173689e3c0992b1e139a59808fe 100644
--- a/src/ic/mips64/access-compiler-mips64.cc
+++ b/src/ic/mips64/access-compiler-mips64.cc
@@ -31,7 +31,7 @@ Register* PropertyAccessCompiler::store_calling_convention() {
   // receiver, name, scratch1, scratch2, scratch3.
   Register receiver = StoreDescriptor::ReceiverRegister();
   Register name = StoreDescriptor::NameRegister();
-  DCHECK(a3.is(StoreTransitionDescriptor::MapRegister()));
+  DCHECK(FLAG_vector_stores || a3.is(StoreTransitionDescriptor::MapRegister()));
   static Register registers[] = {receiver, name, a3, a4, a5};
   return registers;
 }