SkPath::fFirstDirection: seq-cst -> relaxed

include/core/SkPath.h

Index: include/core/SkPath.h
diff --git a/include/core/SkPath.h b/include/core/SkPath.h
index d3673b6d5d35504aff815f9dcb58b06582545a69..2200e03c0c240d3ad6e63c97ac0e9f3db316edb3 100644
--- a/include/core/SkPath.h
+++ b/include/core/SkPath.h
@@ -938,13 +938,12 @@ private:
         kCurrent_Version = 1
     };
 
-    SkAutoTUnref<SkPathRef>   fPathRef;
-
-    int                       fLastMoveToIndex;
-    uint8_t                   fFillType;
-    mutable uint8_t           fConvexity;
-    mutable SkAtomic<uint8_t> fFirstDirection;    // SkPathPriv::FirstDirection
-    mutable SkBool8           fIsVolatile;
+    SkAutoTUnref<SkPathRef>                            fPathRef;
+    int                                                fLastMoveToIndex;
+    uint8_t                                            fFillType;
+    mutable uint8_t                                    fConvexity;
+    mutable SkAtomic<uint8_t, sk_memory_order_relaxed> fFirstDirection;// SkPathPriv::FirstDirection
+    mutable SkBool8                                    fIsVolatile;
 
     /** Resets all fields other than fPathRef to their initial 'empty' values.
      *  Assumes the caller has already emptied fPathRef.