Revert of Code's more readable when SkPMFloat is an Sk4f.

src/opts/SkNx_neon.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_neon_DEFINED
 #define SkNx_neon_DEFINED
 
@@ skipping 169 matching lines @@
 private:
     float64x2_t fVec;
 };
 #endif//defined(SK_CPU_ARM64)
 
 template <>
 class SkNf<4, float> {
     typedef SkNi<4, int32_t> Ni;
 public:
     SkNf(float32x4_t vec) : fVec(vec) {}
+    float32x4_t vec() const { return fVec; }
 
     SkNf() {}
     explicit SkNf(float val)           : fVec(vdupq_n_f32(val)) {}
     static SkNf Load(const float vals[4]) { return vld1q_f32(vals); }
     SkNf(float a, float b, float c, float d) { fVec = (float32x4_t) { a, b, c, d }; }
 
     void store(float vals[4]) const { vst1q_f32(vals, fVec); }
 
     SkNf approxInvert() const {
         float32x4_t est0 = vrecpeq_f32(fVec),
@@ skipping 44 matching lines @@
                     est2 = vmulq_f32(vrsqrtsq_f32(fVec, vmulq_f32(est1, est1)), est1);
         return vmulq_f32(fVec, est2);
     #endif
     }
 
     template <int k> float kth() const {
         SkASSERT(0 <= k && k < 4);
         return vgetq_lane_f32(fVec, k&3);
     }
 
-protected:
+private:
     float32x4_t fVec;
 };
 
 #endif//SkNx_neon_DEFINED