[runtime] Remove the redundant %_IsObject intrinsic.

src/arm64/lithium-codegen-arm64.cc

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/arm64/frames-arm64.h"
 #include "src/arm64/lithium-codegen-arm64.h"
 #include "src/arm64/lithium-gap-resolver-arm64.h"
 #include "src/base/bits.h"
 #include "src/code-factory.h"
 #include "src/code-stubs.h"
@@ skipping 3081 matching lines @@
 
   // Check the marker in the calling frame.
   __ Bind(&check_frame_marker);
   __ Ldr(temp1, MemOperand(temp1, StandardFrameConstants::kMarkerOffset));
 
   EmitCompareAndBranch(
       instr, eq, temp1, Operand(Smi::FromInt(StackFrame::CONSTRUCT)));
 }
 
 
-void LCodeGen::DoIsObjectAndBranch(LIsObjectAndBranch* instr) {
-  Label* is_object = instr->TrueLabel(chunk_);
-  Label* is_not_object = instr->FalseLabel(chunk_);
-  Register value = ToRegister(instr->value());
-  Register map = ToRegister(instr->temp1());
-  Register scratch = ToRegister(instr->temp2());
-
-  __ JumpIfSmi(value, is_not_object);
-  __ JumpIfRoot(value, Heap::kNullValueRootIndex, is_object);
-
-  __ Ldr(map, FieldMemOperand(value, HeapObject::kMapOffset));
-
-  // Check for undetectable objects.
-  __ Ldrb(scratch, FieldMemOperand(map, Map::kBitFieldOffset));
-  __ TestAndBranchIfAnySet(scratch, 1 << Map::kIsUndetectable, is_not_object);
-
-  // Check that instance type is in object type range.
-  __ IsInstanceJSObjectType(map, scratch, NULL);
-  // Flags have been updated by IsInstanceJSObjectType. We can now test the
-  // flags for "le" condition to check if the object's type is a valid
-  // JS object type.
-  EmitBranch(instr, le);
-}
-
-
 Condition LCodeGen::EmitIsString(Register input,
                                  Register temp1,
                                  Label* is_not_string,
                                  SmiCheck check_needed = INLINE_SMI_CHECK) {
   if (check_needed == INLINE_SMI_CHECK) {
     __ JumpIfSmi(input, is_not_string);
   }
   __ CompareObjectType(input, temp1, temp1, FIRST_NONSTRING_TYPE);
 
   return lt;
@@ skipping 2933 matching lines @@
   Handle<ScopeInfo> scope_info = instr->scope_info();
   __ Push(scope_info);
   __ Push(ToRegister(instr->function()));
   CallRuntime(Runtime::kPushBlockContext, 2, instr);
   RecordSafepoint(Safepoint::kNoLazyDeopt);
 }
 
 
 }  // namespace internal
 }  // namespace v8