Make deoptimization stress count global.

src/ia32/lithium-codegen-ia32.cc

Index: src/ia32/lithium-codegen-ia32.cc
diff --git a/src/ia32/lithium-codegen-ia32.cc b/src/ia32/lithium-codegen-ia32.cc
index 770cecb7b41963a49fdfec72f1f4539a998d1d5e..f0238f0aba95a8fcd4fdf7c3270bb5aa9b739dd1 100644
--- a/src/ia32/lithium-codegen-ia32.cc
+++ b/src/ia32/lithium-codegen-ia32.cc
@@ -932,30 +932,22 @@ void LCodeGen::DeoptimizeIf(Condition cc,
   }
 
   if (FLAG_deopt_every_n_times != 0 && !info()->IsStub()) {
-    Handle<SharedFunctionInfo> shared(info()->shared_info());
+    ExternalReference count = ExternalReference::stress_deopt_count(isolate());

[danno, 2013/07/16 14:47:00]

For extra points: Put this code in a code stub with the bulk of this code that
returns whether to deopt or not in a condition code flag. That stub can also
call to a piece of runtime C++ in the case that a deopt will happen an print out
a message if the trace flag is true.

     Label no_deopt;
     __ pushfd();
     __ push(eax);
-    __ push(ebx);
-    __ mov(ebx, shared);
-    __ mov(eax,
-           FieldOperand(ebx, SharedFunctionInfo::kStressDeoptCounterOffset));
+    __ mov(eax, Operand::StaticVariable(count));
     __ sub(Operand(eax), Immediate(Smi::FromInt(1)));
     __ j(not_zero, &no_deopt, Label::kNear);
     if (FLAG_trap_on_deopt) __ int3();
     __ mov(eax, Immediate(Smi::FromInt(FLAG_deopt_every_n_times)));
-    __ mov(FieldOperand(ebx, SharedFunctionInfo::kStressDeoptCounterOffset),
-           eax);
-    __ pop(ebx);
+    __ mov(Operand::StaticVariable(count), eax);
     __ pop(eax);
     __ popfd();
     ASSERT(frame_is_built_);
     __ call(entry, RelocInfo::RUNTIME_ENTRY);
-
     __ bind(&no_deopt);
-    __ mov(FieldOperand(ebx, SharedFunctionInfo::kStressDeoptCounterOffset),
-           eax);
-    __ pop(ebx);
+    __ mov(Operand::StaticVariable(count), eax);
     __ pop(eax);
     __ popfd();
   }