PPC: Don't MISS if you read the hole from certain FastHoley arrays.

src/ppc/lithium-codegen-ppc.cc

Index: src/ppc/lithium-codegen-ppc.cc
diff --git a/src/ppc/lithium-codegen-ppc.cc b/src/ppc/lithium-codegen-ppc.cc
index 5ed21459946d11b6c9b12444c316ad43d1f97926..ae58f31ea396c75a16e3016dc574690b29861c19 100644
--- a/src/ppc/lithium-codegen-ppc.cc
+++ b/src/ppc/lithium-codegen-ppc.cc
@@ -3493,6 +3493,23 @@ void LCodeGen::DoLoadKeyedFixedArray(LLoadKeyed* instr) {
       __ cmp(result, scratch);
       DeoptimizeIf(eq, instr, Deoptimizer::kHole);
     }
+  } else if (instr->hydrogen()->hole_mode() == CONVERT_HOLE_TO_UNDEFINED) {
+    DCHECK(instr->hydrogen()->elements_kind() == FAST_HOLEY_ELEMENTS);
+    Label done;
+    __ LoadRoot(scratch, Heap::kTheHoleValueRootIndex);
+    __ cmp(result, scratch);
+    __ bne(&done);
+    if (info()->IsStub()) {
+      // A stub can safely convert the hole to undefined only if the array
+      // protector cell contains (Smi) Isolate::kArrayProtectorValid. Otherwise
+      // it needs to bail out.
+      __ LoadRoot(result, Heap::kArrayProtectorRootIndex);
+      __ LoadP(result, FieldMemOperand(result, Cell::kValueOffset));
+      __ CmpSmiLiteral(result, Smi::FromInt(Isolate::kArrayProtectorValid), r0);
+      DeoptimizeIf(ne, instr, Deoptimizer::kHole);
+    }
+    __ LoadRoot(result, Heap::kUndefinedValueRootIndex);
+    __ bind(&done);
   }
 }