Revert "Remove deprecated ShouldSelfOptimize machinery."

src/arm64/full-codegen-arm64.cc

 // Copyright 2013 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_ARM64
 
 #include "src/code-factory.h"
 #include "src/code-stubs.h"
@@ skipping 395 matching lines @@
   } else {
     __ Bind(&return_label_);
     if (FLAG_trace) {
       // Push the return value on the stack as the parameter.
       // Runtime::TraceExit returns its parameter in x0.
       __ Push(result_register());
       __ CallRuntime(Runtime::kTraceExit, 1);
       DCHECK(x0.Is(result_register()));
     }
     // Pretend that the exit is a backwards jump to the entry.
-    int distance = masm_->pc_offset() + kCodeSizeMultiplier / 2;
-    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() + kCodeSizeMultiplier / 2;
+      weight = Min(kMaxBackEdgeWeight,
+                   Max(1, distance / kCodeSizeMultiplier));
+    }
     EmitProfilingCounterDecrement(weight);
     Label ok;
     __ B(pl, &ok);
     __ Push(x0);
     __ Call(isolate()->builtins()->InterruptCheck(),
             RelocInfo::CODE_TARGET);
     __ Pop(x0);
     EmitProfilingCounterReset();
     __ Bind(&ok);
 
@@ skipping 4844 matching lines @@
   return previous_;
 }
 
 
 #undef __
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM64