[runtime] Remove the redundant %_IsObject intrinsic.

src/ia32/lithium-codegen-ia32.h

Index: src/ia32/lithium-codegen-ia32.h
diff --git a/src/ia32/lithium-codegen-ia32.h b/src/ia32/lithium-codegen-ia32.h
index 9a34e2d2521dbd7bca2165640325f9dc80234d24..a26903a9ace20c8da515ee3606356a331ae5ba4a 100644
--- a/src/ia32/lithium-codegen-ia32.h
+++ b/src/ia32/lithium-codegen-ia32.h
@@ -270,14 +270,6 @@ class LCodeGen: public LCodeGenBase {
   // true and false label should be made, to optimize fallthrough.
   Condition EmitTypeofIs(LTypeofIsAndBranch* instr, Register input);
 
-  // Emits optimized code for %_IsObject(x).  Preserves input register.
-  // Returns the condition on which a final split to
-  // true and false label should be made, to optimize fallthrough.
-  Condition EmitIsObject(Register input,
-                         Register temp1,
-                         Label* is_not_object,
-                         Label* is_object);
-
   // Emits optimized code for %_IsString(x).  Preserves input register.
   // Returns the condition on which a final split to
   // true and false label should be made, to optimize fallthrough.