Add number allocation call to runtime.cc instead of misusing

src/arm/full-codegen-arm.cc

 // Copyright 2009 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 2143 matching lines @@
   ASSERT(args->length() == 0);
 
   Label slow_allocate_heapnumber;
   Label heapnumber_allocated;
 
   __ LoadRoot(r6, Heap::kHeapNumberMapRootIndex);
   __ AllocateHeapNumber(r4, r1, r2, r6, &slow_allocate_heapnumber);
   __ jmp(&heapnumber_allocated);
 
   __ bind(&slow_allocate_heapnumber);
-  // To allocate a heap number, and ensure that it is not a smi, we
-  // call the runtime function FUnaryMinus on 0, returning the double
-  // -0.0. A new, distinct heap number is returned each time.
-  __ mov(r0, Operand(Smi::FromInt(0)));
-  __ push(r0);
-  __ CallRuntime(Runtime::kNumberUnaryMinus, 1);
+  // Allocate a heap number.
+  __ CallRuntime(Runtime::kNumberAlloc, 0);
   __ mov(r4, Operand(r0));
 
   __ bind(&heapnumber_allocated);
 
   // Convert 32 random bits in r0 to 0.(32 random bits) in a double
   // by computing:
   // ( 1.(20 0s)(32 random bits) x 2^20 ) - (1.0 x 2^20)).
   if (CpuFeatures::IsSupported(VFP3)) {
     __ PrepareCallCFunction(0, r1);
     __ CallCFunction(ExternalReference::random_uint32_function(), 0);
@@ skipping 975 matching lines @@
   __ mov(r1, Operand(r1, ASR, 1));  // Un-smi-tag value.
   __ add(pc, r1, Operand(masm_->CodeObject()));
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM