[runtime] Remove the redundant %_IsObject intrinsic.

src/x87/lithium-x87.h

Index: src/x87/lithium-x87.h
diff --git a/src/x87/lithium-x87.h b/src/x87/lithium-x87.h
index 3e6f67af16bee2887f31de1c3cc3f617ddb14997..a1dca8a4ef90bfb447e03555bb7841885d3af97f 100644
--- a/src/x87/lithium-x87.h
+++ b/src/x87/lithium-x87.h
@@ -96,7 +96,6 @@ class LCodeGen;
   V(Integer32ToDouble)                       \
   V(InvokeFunction)                          \
   V(IsConstructCallAndBranch)                \
-  V(IsObjectAndBranch)                       \
   V(IsStringAndBranch)                       \
   V(IsSmiAndBranch)                          \
   V(IsUndetectableAndBranch)                 \
@@ -1006,22 +1005,6 @@ class LCompareMinusZeroAndBranch final : public LControlInstruction<1, 0> {
 };
 
 
-class LIsObjectAndBranch final : public LControlInstruction<1, 1> {
- public:
-  LIsObjectAndBranch(LOperand* value, LOperand* temp) {
-    inputs_[0] = value;
-    temps_[0] = temp;
-  }
-
-  LOperand* value() { return inputs_[0]; }
-  LOperand* temp() { return temps_[0]; }
-
-  DECLARE_CONCRETE_INSTRUCTION(IsObjectAndBranch, "is-object-and-branch")
-
-  void PrintDataTo(StringStream* stream) override;
-};
-
-
 class LIsStringAndBranch final : public LControlInstruction<1, 1> {
  public:
   LIsStringAndBranch(LOperand* value, LOperand* temp) {