[runtime] Remove the redundant %_IsObject intrinsic.

src/ia32/lithium-ia32.cc

Index: src/ia32/lithium-ia32.cc
diff --git a/src/ia32/lithium-ia32.cc b/src/ia32/lithium-ia32.cc
index 7225df99fbb52a2694201db0caca42e2e86dfcaf..598170c3e528a03e16f2cef43a3a58b82f96fd29 100644
--- a/src/ia32/lithium-ia32.cc
+++ b/src/ia32/lithium-ia32.cc
@@ -187,13 +187,6 @@ void LCompareNumericAndBranch::PrintDataTo(StringStream* stream) {
 }
 
 
-void LIsObjectAndBranch::PrintDataTo(StringStream* stream) {
-  stream->Add("if is_object(");
-  value()->PrintTo(stream);
-  stream->Add(") then B%d else B%d", true_block_id(), false_block_id());
-}
-
-
 void LIsStringAndBranch::PrintDataTo(StringStream* stream) {
   stream->Add("if is_string(");
   value()->PrintTo(stream);
@@ -1736,13 +1729,6 @@ LInstruction* LChunkBuilder::DoCompareMinusZeroAndBranch(
 }
 
 
-LInstruction* LChunkBuilder::DoIsObjectAndBranch(HIsObjectAndBranch* instr) {
-  DCHECK(instr->value()->representation().IsSmiOrTagged());
-  LOperand* temp = TempRegister();
-  return new(zone()) LIsObjectAndBranch(UseRegister(instr->value()), temp);
-}
-
-
 LInstruction* LChunkBuilder::DoIsStringAndBranch(HIsStringAndBranch* instr) {
   DCHECK(instr->value()->representation().IsTagged());
   LOperand* temp = TempRegister();