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

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

Index: src/ic/ppc/access-compiler-ppc.cc
diff --git a/src/ic/ppc/access-compiler-ppc.cc b/src/ic/ppc/access-compiler-ppc.cc
index 2021b80fd88ac5aedc6e83a22588d2b8e1ce9e7f..fcbbc6612188eb043036b7b03279710445006ad9 100644
--- a/src/ic/ppc/access-compiler-ppc.cc
+++ b/src/ic/ppc/access-compiler-ppc.cc
@@ -31,7 +31,7 @@ Register* PropertyAccessCompiler::store_calling_convention() {
   // receiver, name, scratch1, scratch2, scratch3.
   Register receiver = StoreDescriptor::ReceiverRegister();
   Register name = StoreDescriptor::NameRegister();
-  DCHECK(r6.is(StoreTransitionDescriptor::MapRegister()));
+  DCHECK(FLAG_vector_stores || r6.is(StoreTransitionDescriptor::MapRegister()));
   static Register registers[] = {receiver, name, r6, r7, r8};
   return registers;
 }