Never hchange nan-hole to hole or hole to nan-hole.

src/x64/lithium-x64.cc

Index: src/x64/lithium-x64.cc
diff --git a/src/x64/lithium-x64.cc b/src/x64/lithium-x64.cc
index 4b2ffbe2128d324fada1f9c648a5d83d21ae684f..1f975bb5bde70019c8f5d14df59eaef6dd033d9a 100644
--- a/src/x64/lithium-x64.cc
+++ b/src/x64/lithium-x64.cc
@@ -1643,6 +1643,13 @@ LInstruction* LChunkBuilder::DoCompareObjectEqAndBranch(
 }
 
 
+LInstruction* LChunkBuilder::DoCompareHoleAndBranch(
+    HCompareHoleAndBranch* instr) {
+  LOperand* object = UseRegisterAtStart(instr->object());
+  return new(zone()) LCmpHoleAndBranch(object);
+}
+
+
 LInstruction* LChunkBuilder::DoIsObjectAndBranch(HIsObjectAndBranch* instr) {
   ASSERT(instr->value()->representation().IsTagged());
   return new(zone()) LIsObjectAndBranch(UseRegisterAtStart(instr->value()));