[stubs] Split ToNumberStub into reusable subparts.

src/arm/macro-assembler-arm.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.
 
 #include <limits.h>  // For LONG_MIN, LONG_MAX.
 
 #if V8_TARGET_ARCH_ARM
 
 #include "src/base/bits.h"
 #include "src/base/division-by-constant.h"
@@ skipping 3028 matching lines @@
 
 void MacroAssembler::JumpIfEitherSmi(Register reg1,
                                      Register reg2,
                                      Label* on_either_smi) {
   STATIC_ASSERT(kSmiTag == 0);
   tst(reg1, Operand(kSmiTagMask));
   tst(reg2, Operand(kSmiTagMask), ne);
   b(eq, on_either_smi);
 }
 
+void MacroAssembler::AssertNotNumber(Register object) {
+  if (emit_debug_code()) {
+    STATIC_ASSERT(kSmiTag == 0);
+    tst(object, Operand(kSmiTagMask));
+    Check(ne, kOperandIsANumber);
+    push(object);
+    CompareObjectType(object, object, object, HEAP_NUMBER_TYPE);
+    pop(object);
+    Check(ne, kOperandIsANumber);
+  }
+}
 
 void MacroAssembler::AssertNotSmi(Register object) {
   if (emit_debug_code()) {
     STATIC_ASSERT(kSmiTag == 0);
     tst(object, Operand(kSmiTagMask));
     Check(ne, kOperandIsASmi);
   }
 }
 
 
@@ skipping 872 matching lines @@
     }
   }
   if (mag.shift > 0) mov(result, Operand(result, ASR, mag.shift));
   add(result, result, Operand(dividend, LSR, 31));
 }
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM