[Isolates] Merge crankshaft (r5922 from bleeding_edge).

src/arm/cpu-arm.cc

 // Copyright 2006-2009 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 24 matching lines @@
 #if defined(V8_TARGET_ARCH_ARM)
 
 #include "cpu.h"
 #include "macro-assembler.h"
 #include "simulator.h"  // for cache flushing.
 
 namespace v8 {
 namespace internal {
 
 void CPU::Setup() {
-  Isolate::Current()->cpu_features()->Probe();
+  CpuFeatures* cpu_features = Isolate::Current()->cpu_features();
+  cpu_features->Probe(true);
+  if (!cpu_features->IsSupported(VFP3) || Serializer::enabled()) {
+    V8::DisableCrankshaft();
+  }
 }
 
 
 void CPU::FlushICache(void* start, size_t size) {
 #if defined (USE_SIMULATOR)
   // Not generating ARM instructions for C-code. This means that we are
   // building an ARM emulator based target.  We should notify the simulator
   // that the Icache was flushed.
   // None of this code ends up in the snapshot so there are no issues
   // around whether or not to generate the code when building snapshots.
@@ skipping 75 matching lines @@
 #if !defined (__arm__) || !defined(CAN_USE_ARMV5_INSTRUCTIONS)
   UNIMPLEMENTED();  // when building ARM emulator target
 #else
   asm volatile("bkpt 0");
 #endif
 }
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM