VectorICs: use a vector slot to aid in array literal processing.

src/full-codegen/mips/full-codegen-mips.cc

Index: src/full-codegen/mips/full-codegen-mips.cc
diff --git a/src/full-codegen/mips/full-codegen-mips.cc b/src/full-codegen/mips/full-codegen-mips.cc
index 537cb0918e89233d69885a9fc6e39cb2801655d3..3371f63925f000a5d2fa13e6ee5dc62deddf0c21 100644
--- a/src/full-codegen/mips/full-codegen-mips.cc
+++ b/src/full-codegen/mips/full-codegen-mips.cc
@@ -1801,7 +1801,16 @@ void FullCodeGenerator::VisitArrayLiteral(ArrayLiteral* expr) {
 
     VisitForAccumulatorValue(subexpr);
 
-    if (has_fast_elements) {
+    if (FLAG_vector_stores) {
+      __ li(StoreDescriptor::NameRegister(),
+            Operand(Smi::FromInt(array_index)));
+      __ lw(StoreDescriptor::ReceiverRegister(), MemOperand(sp, kPointerSize));
+      __ mov(StoreDescriptor::ValueRegister(), result_register());
+      EmitLoadStoreICSlot(expr->LiteralFeedbackSlot());
+      Handle<Code> ic =
+          CodeFactory::KeyedStoreIC(isolate(), language_mode()).code();
+      CallIC(ic);
+    } else if (has_fast_elements) {
       int offset = FixedArray::kHeaderSize + (array_index * kPointerSize);
       __ lw(t2, MemOperand(sp, kPointerSize));  // Copy of array literal.
       __ lw(a1, FieldMemOperand(t2, JSObject::kElementsOffset));