Remove overly-promiscuous SkNx syntax sugar.

src/core/SkNx.h

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkNx_DEFINED
 #define SkNx_DEFINED
 
@@ skipping 242 matching lines @@
     // We do double sqrts natively, or via floats for any other type.
     template <typename U>
     static U      Sqrt(U      val) { return (U) ::sqrtf((float)val); }
     static double Sqrt(double val) { return     ::sqrt (       val); }
 
     T fVal;
 };
 
 }  // namespace
 
-// Generic syntax sugar that should work equally well for all implementations.
-template <typename T> T operator - (const T& l) { return T(0) - l; }
-
-template <typename L, typename R> L& operator += (L& l, const R& r) { return (l = l + r); }
-template <typename L, typename R> L& operator -= (L& l, const R& r) { return (l = l - r); }
-template <typename L, typename R> L& operator *= (L& l, const R& r) { return (l = l * r); }
-template <typename L, typename R> L& operator /= (L& l, const R& r) { return (l = l / r); }
-
-template <typename L> L& operator <<= (L& l, int bits) { return (l = l << bits); }
-template <typename L> L& operator >>= (L& l, int bits) { return (l = l >> bits); }
-
 // Include platform specific specializations if available.
 #ifndef SKNX_NO_SIMD
     #if SK_CPU_SSE_LEVEL >= SK_CPU_SSE_LEVEL_SSE2
         #include "../opts/SkNx_sse.h"
     #elif defined(SK_ARM_HAS_NEON)
         #include "../opts/SkNx_neon.h"
     #endif
 #endif
 
 #undef REQUIRE
 
 typedef SkNf<2,    float> Sk2f;
 typedef SkNf<2,   double> Sk2d;
 typedef SkNf<2, SkScalar> Sk2s;
 
 typedef SkNf<4,    float> Sk4f;
 typedef SkNf<4,   double> Sk4d;
 typedef SkNf<4, SkScalar> Sk4s;
 
 typedef SkNi<4,  uint16_t> Sk4h;
 typedef SkNi<8,  uint16_t> Sk8h;
 typedef SkNi<16, uint16_t> Sk16h;
 
 typedef SkNi<16, uint8_t> Sk16b;
 
 typedef SkNi<4,  int32_t> Sk4i;
 typedef SkNi<4, uint32_t> Sk4u;
 
 #endif//SkNx_DEFINED