Clean up some unused atomic routines.

bench/RefCntBench.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #include <memory>
 #include "Benchmark.h"
 #include "SkAtomics.h"
 #include "SkRefCnt.h"
@@ skipping 20 matching lines @@
         for (int i = 0; i < loops; ++i) {
             sk_atomic_inc(&fX);
         }
     }
 
 private:
     int32_t fX;
     typedef Benchmark INHERITED;
 };
 
-class AtomicInc64 : public Benchmark {
-public:
-    AtomicInc64() : fX(0) {}
-
-    bool isSuitableFor(Backend backend) override {
-        return backend == kNonRendering_Backend;
-    }
-
-protected:
-    const char* onGetName() override {
-        return "atomic_inc_64";
-    }
-
-    void onDraw(int loops, SkCanvas*) override {
-        for (int i = 0; i < loops; ++i) {
-            sk_atomic_inc(&fX);
-        }
-    }
-
-private:
-    int64_t fX;
-    typedef Benchmark INHERITED;
-};
-
 class RefCntBench_Stack : public Benchmark {
 public:
     bool isSuitableFor(Backend backend) override {
         return backend == kNonRendering_Backend;
     }
 
 protected:
     const char* onGetName() override {
         return "ref_cnt_stack";
     }
@@ skipping 156 matching lines @@
         }
     }
 
 private:
     typedef Benchmark INHERITED;
 };
 
 ///////////////////////////////////////////////////////////////////////////////
 
 DEF_BENCH( return new AtomicInc32(); )
-DEF_BENCH( return new AtomicInc64(); )
 
 DEF_BENCH( return new RefCntBench_Stack(); )
 DEF_BENCH( return new RefCntBench_Heap(); )
 DEF_BENCH( return new RefCntBench_New(); )
 
 DEF_BENCH( return new WeakRefCntBench_Stack(); )
 DEF_BENCH( return new WeakRefCntBench_Heap(); )
 DEF_BENCH( return new WeakRefCntBench_New(); )