Remove bulk float <-> half routines. These are dead code.

tests/Float16Test.cpp

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "Test.h"
 #include "SkAutoPixmapStorage.h"
 #include "SkColor.h"
@@ skipping 37 matching lines @@
 
     SkPM4f origpm4 = c4.premul();
     for (int y = 0; y < pm.height(); ++y) {
         for (int x = 0; x < pm.width(); ++x) {
             SkPM4f pm4 = SkPM4f::FromF16(pm.addrF16(x, y));
             REPORTER_ASSERT(reporter, eq_within_half_float(origpm4, pm4));
         }
     }
 }
 
-DEF_TEST(float_to_half, reporter) {
-    const float    fs[] = {    1.0,    2.0,    3.0,    4.0,    5.0,    6.0,    7.0 };
-    const uint16_t hs[] = { 0x3c00, 0x4000, 0x4200, 0x4400, 0x4500, 0x4600, 0x4700 };
-
-    uint16_t hscratch[7];
-    SkOpts::float_to_half(hscratch, fs, 7);
-    REPORTER_ASSERT(reporter, 0 == memcmp(hscratch, hs, sizeof(hs)));
-
-    float fscratch[7];
-    SkOpts::half_to_float(fscratch, hs, 7);
-    REPORTER_ASSERT(reporter, 0 == memcmp(fscratch, fs, sizeof(fs)));
-}
-
 static uint32_t u(float f) {
     uint32_t x;
     memcpy(&x, &f, 4);
     return x;
 }
 
 DEF_TEST(HalfToFloat_01, r) {
     for (uint16_t h = 0; h < 0x8000; h++) {
         float f = SkHalfToFloat(h);
         if (f >= 0 && f <= 1) {
@@ skipping 26 matching lines @@
             bool ok = (h1 == h2 || h1 == h2-1);
             REPORTER_ASSERT(r, ok);
             if (!ok) {
                 SkDebugf("%08x (%d) -> %04x (%d), want %04x (%d)\n",
                          bits, bits>>23, h1, h1>>10, h2, h2>>10);
                 break;
             }
         }
     }
 }