Port SkLazyPtr to new SkAtomics.h

include/core/SkAtomics.h

 #ifndef SkAtomics_DEFINED
 #define SkAtomics_DEFINED
 
 // This file is not part of the public Skia API.
 #include "SkTypes.h"
 
 enum sk_memory_order {
     sk_memory_order_relaxed,
     sk_memory_order_consume,
     sk_memory_order_acquire,
@@ skipping 49 matching lines @@
             break;
         }
     } while(!sk_atomic_compare_exchange(ptr, &prev, prev+1));
     return prev;
 }
 
 template <typename T>
 T sk_acquire_load(T* ptr) { return sk_atomic_load(ptr, sk_memory_order_acquire); }
 
 template <typename T>
-T sk_consume_load(T* ptr) {
-    // On every platform we care about, consume is the same as relaxed.
-    // If we pass consume here, some compilers turn that into acquire, which is overkill.
-    return sk_atomic_load(ptr, sk_memory_order_relaxed);
-}
-
-template <typename T>
 void sk_release_store(T* ptr, T val) { sk_atomic_store(ptr, val, sk_memory_order_release); }
 
 inline void sk_membar_acquire__after_atomic_dec() {}
 inline void sk_membar_acquire__after_atomic_conditional_inc() {}
 
 #endif//SkAtomics_DEFINED