VM initialization refactoring.

src/ia32/builtins-ia32.cc

 // Copyright 2010 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 1505 matching lines @@
 
   // -------------------------------------------
   // Dont adapt arguments.
   // -------------------------------------------
   __ bind(&dont_adapt_arguments);
   __ jmp(Operand(edx));
 }
 
 
 void Builtins::Generate_OnStackReplacement(MacroAssembler* masm) {
-  // We shouldn't be performing on-stack replacement in the first
-  // place if the CPU features we need for the optimized Crankshaft
-  // code aren't supported.
-  CpuFeatures* cpu_features = masm->isolate()->cpu_features();
-  cpu_features->Probe(false);
-  if (!cpu_features->IsSupported(SSE2)) {
+  CpuFeatures::TryForceFeatureScope scope(SSE2);
+  if (!CpuFeatures::IsSupported(SSE2)) {
     __ Abort("Unreachable code: Cannot optimize without SSE2 support.");
     return;
   }
 
   // Get the loop depth of the stack guard check. This is recorded in
   // a test(eax, depth) instruction right after the call.
   Label stack_check;
   __ mov(ebx, Operand(esp, 0));  // return address
   if (FLAG_debug_code) {
     __ cmpb(Operand(ebx, 0), Assembler::kTestAlByte);
@@ skipping 49 matching lines @@
   Deoptimizer::EntryGenerator generator(masm, Deoptimizer::OSR);
   generator.Generate();
 }
 
 
 #undef __
 }
 }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32