PPC: [compiler] No need to push literal index in VisitArrayLiteral.

Port 9846f386

Original commit message:
    The literal index is being pushed onto the stack while evaluating
    the non-constant subexpressions, but never used in fullcodegen (and
    hence not used in the optimizing compilers).

R=bmeurer@chromium.org, joransiu@ca.ibm.com, jyan@ca.ibm.com, michael_dawson@ca.ibm.com
BUG=

Review URL: https://codereview.chromium.org/1468273005

Cr-Commit-Position: refs/heads/master@{#32229}

src/full-codegen/ppc/full-codegen-ppc.cc

@@ -1730,14 +1730,13 @@ void FullCodeGenerator::VisitArrayLiteral(ArrayLiteral* expr) {
 
     if (!result_saved) {
       __ push(r3);
-      __ Push(Smi::FromInt(expr->literal_index()));
       result_saved = true;
     }
     VisitForAccumulatorValue(subexpr);
 
     __ LoadSmiLiteral(StoreDescriptor::NameRegister(),
                       Smi::FromInt(array_index));
-    __ LoadP(StoreDescriptor::ReceiverRegister(), MemOperand(sp, kPointerSize));
+    __ LoadP(StoreDescriptor::ReceiverRegister(), MemOperand(sp, 0));
     EmitLoadStoreICSlot(expr->LiteralFeedbackSlot());
     Handle<Code> ic =
         CodeFactory::KeyedStoreIC(isolate(), language_mode()).code();
@@ -1752,7 +1751,6 @@ void FullCodeGenerator::VisitArrayLiteral(ArrayLiteral* expr) {
   // (inclusive) and these elements gets appended to the array. Note that the
   // number elements an iterable produces is unknown ahead of time.
   if (array_index < length && result_saved) {
-    __ Drop(1);  // literal index
     __ Pop(r3);
     result_saved = false;
   }
@@ -1773,7 +1771,6 @@ void FullCodeGenerator::VisitArrayLiteral(ArrayLiteral* expr) {
   }
 
   if (result_saved) {
-    __ Drop(1);  // literal index
     context()->PlugTOS();
   } else {
     context()->Plug(r3);