Remove HIsNilAndBranch (it's now unused)

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 c89efd95af651c755bf15b4b0070b8568e368dcb..e7bc08c4b2195f1633ed99b9bc814e05092348e3 100644
--- a/src/x64/lithium-x64.cc
+++ b/src/x64/lithium-x64.cc
@@ -219,15 +219,6 @@ void LCmpIDAndBranch::PrintDataTo(StringStream* stream) {
 }
 
 
-void LIsNilAndBranch::PrintDataTo(StringStream* stream) {
-  stream->Add("if ");
-  value()->PrintTo(stream);
-  stream->Add(kind() == kStrictEquality ? " === " : " == ");
-  stream->Add(nil() == kNullValue ? "null" : "undefined");
-  stream->Add(" then B%d else B%d", true_block_id(), false_block_id());
-}
-
-
 void LIsObjectAndBranch::PrintDataTo(StringStream* stream) {
   stream->Add("if is_object(");
   value()->PrintTo(stream);
@@ -1641,13 +1632,6 @@ LInstruction* LChunkBuilder::DoCompareConstantEqAndBranch(
 }
 
 
-LInstruction* LChunkBuilder::DoIsNilAndBranch(HIsNilAndBranch* instr) {
-  ASSERT(instr->value()->representation().IsTagged());
-  LOperand* temp = instr->kind() == kStrictEquality ? NULL : TempRegister();
-  return new(zone()) LIsNilAndBranch(UseRegisterAtStart(instr->value()), temp);
-}
-
-
 LInstruction* LChunkBuilder::DoIsObjectAndBranch(HIsObjectAndBranch* instr) {
   ASSERT(instr->value()->representation().IsTagged());
   return new(zone()) LIsObjectAndBranch(UseRegisterAtStart(instr->value()));