Revert of Sketch SkPMFloat

src/core/SkPMFloat.h

-#ifndef SkPM_DEFINED
-#define SkPM_DEFINED
-
-#include "SkTypes.h"
-#include "SkColor.h"
-
-// As usual, there are two ways to increase alignment... the MSVC way and the everyone-else way.
-#ifdef _MSC_VER
-    #define ALIGN(N) __declspec(align(N))
-#else
-    #define ALIGN(N) __attribute__((aligned(N)))
-#endif
-
-// A pre-multiplied color in the same order as SkPMColor storing each component as a float.
-struct ALIGN(16) SkPMFloat {
-    float fColor[4];
-
-    float a() const { return fColor[SK_A32_SHIFT / 8]; }
-    float r() const { return fColor[SK_R32_SHIFT / 8]; }
-    float g() const { return fColor[SK_G32_SHIFT / 8]; }
-    float b() const { return fColor[SK_B32_SHIFT / 8]; }
-
-    void setA(float val) { fColor[SK_A32_SHIFT / 8] = val; }
-    void setR(float val) { fColor[SK_R32_SHIFT / 8] = val; }
-    void setG(float val) { fColor[SK_G32_SHIFT / 8] = val; }
-    void setB(float val) { fColor[SK_B32_SHIFT / 8] = val; }
-
-    void set(SkPMColor);
-
-    SkPMColor     get() const;  // May SkASSERT(this->isValid()).
-    SkPMColor clamped() const;  // Will clamp all values to [0,1], then SkASSERT(this->isValid()).
-
-    bool isValid() const {
-        return this->a() >= 0 && this->a() <= 1
-            && this->r() >= 0 && this->r() <= this->a()
-            && this->g() >= 0 && this->g() <= this->a()
-            && this->b() >= 0 && this->b() <= this->a();
-    }
-};
-#undef ALIGN
-
-#if SK_CPU_SSE_LEVEL >= SK_CPU_SSE_LEVEL_SSE2
-    #include "../opts/SkPMFloat_SSE2.h"
-#elif defined(__ARM_NEON__)
-    #include "../opts/SkPMFloat_neon.h"
-#else
-    #include "../opts/SkPMFloat_none.h"
-#endif
-
-#endif//SkPM_DEFINED