[stubs] Split ToNumberStub into reusable subparts.

src/ia32/macro-assembler-ia32.cc

 // Copyright 2012 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_IA32
 
 #include "src/base/bits.h"
 #include "src/base/division-by-constant.h"
 #include "src/bootstrapper.h"
 #include "src/codegen.h"
@@ skipping 941 matching lines @@
   if (emit_debug_code()) {
     Label ok;
     JumpIfSmi(object, &ok);
     cmp(FieldOperand(object, HeapObject::kMapOffset),
         isolate()->factory()->heap_number_map());
     Check(equal, kOperandNotANumber);
     bind(&ok);
   }
 }
 
+void MacroAssembler::AssertNotNumber(Register object) {
+  if (emit_debug_code()) {
+    test(object, Immediate(kSmiTagMask));
+    Check(not_equal, kOperandIsANumber);
+    cmp(FieldOperand(object, HeapObject::kMapOffset),
+        isolate()->factory()->heap_number_map());
+    Check(not_equal, kOperandIsANumber);
+  }
+}
 
 void MacroAssembler::AssertSmi(Register object) {
   if (emit_debug_code()) {
     test(object, Immediate(kSmiTagMask));
     Check(equal, kOperandIsNotASmi);
   }
 }
 
 
 void MacroAssembler::AssertString(Register object) {
@@ skipping 2413 matching lines @@
   mov(eax, dividend);
   shr(eax, 31);
   add(edx, eax);
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_IA32