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

src/ppc/lithium-ppc.cc

Index: src/ppc/lithium-ppc.cc
diff --git a/src/ppc/lithium-ppc.cc b/src/ppc/lithium-ppc.cc
index d70143c3440b203756b0121b015170e6b3648dae..81eb3fd6e47a957e15e72379988e340e668b6bb1 100644
--- a/src/ppc/lithium-ppc.cc
+++ b/src/ppc/lithium-ppc.cc
@@ -2190,16 +2190,21 @@ LInstruction* LChunkBuilder::DoLoadKeyed(HLoadKeyed* instr) {
     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;