[runtime] Remove the redundant %_IsObject intrinsic.

src/x64/lithium-codegen-x64.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.
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/base/bits.h"
 #include "src/code-factory.h"
 #include "src/code-stubs.h"
 #include "src/cpu-profiler.h"
@@ skipping 2409 matching lines @@
     __ cmpl(FieldOperand(value, HeapNumber::kExponentOffset),
             Immediate(0x1));
     EmitFalseBranch(instr, no_overflow);
     __ cmpl(FieldOperand(value, HeapNumber::kMantissaOffset),
             Immediate(0x00000000));
     EmitBranch(instr, equal);
   }
 }
 
 
-Condition LCodeGen::EmitIsObject(Register input,
-                                 Label* is_not_object,
-                                 Label* is_object) {
-  DCHECK(!input.is(kScratchRegister));
-
-  __ JumpIfSmi(input, is_not_object);
-
-  __ CompareRoot(input, Heap::kNullValueRootIndex);
-  __ j(equal, is_object);
-
-  __ movp(kScratchRegister, FieldOperand(input, HeapObject::kMapOffset));
-  // Undetectable objects behave like undefined.
-  __ testb(FieldOperand(kScratchRegister, Map::kBitFieldOffset),
-           Immediate(1 << Map::kIsUndetectable));
-  __ j(not_zero, is_not_object);
-
-  __ movzxbl(kScratchRegister,
-             FieldOperand(kScratchRegister, Map::kInstanceTypeOffset));
-  __ cmpb(kScratchRegister, Immediate(FIRST_NONCALLABLE_SPEC_OBJECT_TYPE));
-  __ j(below, is_not_object);
-  __ cmpb(kScratchRegister, Immediate(LAST_NONCALLABLE_SPEC_OBJECT_TYPE));
-  return below_equal;
-}
-
-
-void LCodeGen::DoIsObjectAndBranch(LIsObjectAndBranch* instr) {
-  Register reg = ToRegister(instr->value());
-
-  Condition true_cond = EmitIsObject(
-      reg, instr->FalseLabel(chunk_), instr->TrueLabel(chunk_));
-
-  EmitBranch(instr, true_cond);
-}
-
-
 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);
   }
 
   Condition cond =  masm_->IsObjectStringType(input, temp1, temp1);
 
@@ skipping 3499 matching lines @@
   RecordSafepoint(Safepoint::kNoLazyDeopt);
 }
 
 
 #undef __
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X64