Remove HIsNilAndBranch (it's now unused)

src/arm/lithium-arm.cc

Index: src/arm/lithium-arm.cc
diff --git a/src/arm/lithium-arm.cc b/src/arm/lithium-arm.cc
index 08a940d017c5632cd08b2d8616b45416505045cd..edc1120c5bb5665444b2117848ed632704de4186 100644
--- a/src/arm/lithium-arm.cc
+++ b/src/arm/lithium-arm.cc
@@ -217,15 +217,6 @@ 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);
@@ -1719,12 +1710,6 @@ LInstruction* LChunkBuilder::DoCompareConstantEqAndBranch(
 }
 
 
-LInstruction* LChunkBuilder::DoIsNilAndBranch(HIsNilAndBranch* instr) {
-  ASSERT(instr->value()->representation().IsTagged());
-  return new(zone()) LIsNilAndBranch(UseRegisterAtStart(instr->value()));
-}
-
-
 LInstruction* LChunkBuilder::DoIsObjectAndBranch(HIsObjectAndBranch* instr) {
   ASSERT(instr->value()->representation().IsTagged());
   LOperand* value = UseRegisterAtStart(instr->value());