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

src/ppc/lithium-ppc.cc

 // Copyright 2014 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <sstream>
 
 #include "src/v8.h"
 
 #include "src/hydrogen-osr.h"
 #include "src/lithium-inl.h"
@@ skipping 2172 matching lines @@
     result = DefineAsRegister(new (zone()) LLoadKeyed(obj, key));
   } else {
     DCHECK((instr->representation().IsInteger32() &&
             !IsDoubleOrFloatElementsKind(elements_kind)) ||
            (instr->representation().IsDouble() &&
             IsDoubleOrFloatElementsKind(elements_kind)));
     LOperand* backing_store = UseRegister(instr->elements());
     result = DefineAsRegister(new (zone()) LLoadKeyed(backing_store, key));
   }
 
-  if ((instr->is_external() || instr->is_fixed_typed_array())
-          ?
-          // see LCodeGen::DoLoadKeyedExternalArray
-          ((elements_kind == EXTERNAL_UINT32_ELEMENTS ||
-            elements_kind == UINT32_ELEMENTS) &&
-           !instr->CheckFlag(HInstruction::kUint32))
-          :
-          // see LCodeGen::DoLoadKeyedFixedDoubleArray and
-          // LCodeGen::DoLoadKeyedFixedArray
-          instr->RequiresHoleCheck()) {
+  bool needs_environment;
+  if (instr->is_external() || instr->is_fixed_typed_array()) {
+    // see LCodeGen::DoLoadKeyedExternalArray
+    needs_environment = (elements_kind == EXTERNAL_UINT32_ELEMENTS ||
+                         elements_kind == UINT32_ELEMENTS) &&
+                        !instr->CheckFlag(HInstruction::kUint32);
+  } else {
+    // see LCodeGen::DoLoadKeyedFixedDoubleArray and
+    // LCodeGen::DoLoadKeyedFixedArray
+    needs_environment =
+        instr->RequiresHoleCheck() ||
+        (instr->hole_mode() == CONVERT_HOLE_TO_UNDEFINED && info()->IsStub());
+  }
+
+  if (needs_environment) {
     result = AssignEnvironment(result);
   }
   return result;
 }
 
 
 LInstruction* LChunkBuilder::DoLoadKeyedGeneric(HLoadKeyedGeneric* instr) {
   LOperand* context = UseFixed(instr->context(), cp);
   LOperand* object =
       UseFixed(instr->object(), LoadDescriptor::ReceiverRegister());
@@ skipping 386 matching lines @@
 LInstruction* LChunkBuilder::DoAllocateBlockContext(
     HAllocateBlockContext* instr) {
   LOperand* context = UseFixed(instr->context(), cp);
   LOperand* function = UseRegisterAtStart(instr->function());
   LAllocateBlockContext* result =
       new (zone()) LAllocateBlockContext(context, function);
   return MarkAsCall(DefineFixed(result, cp), instr);
 }
 }
 }  // namespace v8::internal