Revert "Remove deprecated ShouldSelfOptimize machinery."

src/x64/full-codegen-x64.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_X64
 
 #include "src/code-factory.h"
 #include "src/code-stubs.h"
@@ skipping 368 matching lines @@
   Comment cmnt(masm_, "[ Return sequence");
   if (return_label_.is_bound()) {
     __ jmp(&return_label_);
   } else {
     __ bind(&return_label_);
     if (FLAG_trace) {
       __ Push(rax);
       __ 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);
     __ Push(rax);
     __ call(isolate()->builtins()->InterruptCheck(),
             RelocInfo::CODE_TARGET);
     __ Pop(rax);
     EmitProfilingCounterReset();
     __ bind(&ok);
 #ifdef DEBUG
@@ skipping 4785 matching lines @@
   DCHECK_EQ(isolate->builtins()->OsrAfterStackCheck()->entry(),
             Assembler::target_address_at(call_target_address,
                                          unoptimized_code));
   return OSR_AFTER_STACK_CHECK;
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64