Revert "Remove deprecated ShouldSelfOptimize machinery."

src/ia32/full-codegen-ia32.cc

Index: src/ia32/full-codegen-ia32.cc
diff --git a/src/ia32/full-codegen-ia32.cc b/src/ia32/full-codegen-ia32.cc
index 4d4f788d10b71f9a497192d5e948d6910b7c6aac..672b46bb2568859538118bc11e82d28c74f877d1 100644
--- a/src/ia32/full-codegen-ia32.cc
+++ b/src/ia32/full-codegen-ia32.cc
@@ -383,9 +383,14 @@ void FullCodeGenerator::EmitReturnSequence() {
       __ CallRuntime(Runtime::kTraceExit, 1);
     }
     // Pretend that the exit is a backwards jump to the entry.
-    int distance = masm_->pc_offset();
-    int weight =
-        Min(kMaxBackEdgeWeight, Max(1, distance / kCodeSizeMultiplier));
+    int weight = 1;
+    if (info_->ShouldSelfOptimize()) {
+      weight = FLAG_interrupt_budget / FLAG_self_opt_count;
+    } else {
+      int distance = masm_->pc_offset();
+      weight = Min(kMaxBackEdgeWeight,
+                   Max(1, distance / kCodeSizeMultiplier));
+    }
     EmitProfilingCounterDecrement(weight);
     Label ok;
     __ j(positive, &ok, Label::kNear);