[GN] Add support for disabling opts via SK_BUILD_NO_OPTS define.

bench/SkBlend_optsBench.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 <tuple>
 
 #include "Benchmark.h"
@@ skipping 133 matching lines @@
 private:
     int fCount;
     SkAutoTArray<uint32_t> fDst;
     SkString fFileName;
     SkString fName;
     SkPixmap fPixmap;
 
     typedef Benchmark INHERITED;
 };
 
-#if defined(SK_CPU_X86) && !defined(SK_BUILD_FOR_IOS)
+#if defined(SK_CPU_X86) && !defined(SK_BUILD_NO_OPTS)
 #define BENCHES(fileName)                                                        \
 DEF_BENCH( return new LinearSrcOverBench<SrcOverVSkOptsBruteForce>(fileName); )  \
 DEF_BENCH( return new LinearSrcOverBench<SrcOverVSkOptsTrivial>(fileName); )     \
 DEF_BENCH( return new LinearSrcOverBench<SrcOverVSkOptsNonSimdCore>(fileName); ) \
 DEF_BENCH( return new LinearSrcOverBench<SrcOverVSkOptsDefault>(fileName); )     \
 DEF_BENCH( return new LinearSrcOverBench<SrcOverVSkOptsSSE41>(fileName); )
 #else
 #define BENCHES(fileName)                                                        \
 DEF_BENCH( return new LinearSrcOverBench<SrcOverVSkOptsBruteForce>(fileName); )  \
 DEF_BENCH( return new LinearSrcOverBench<SrcOverVSkOptsTrivial>(fileName); )     \
 DEF_BENCH( return new LinearSrcOverBench<SrcOverVSkOptsNonSimdCore>(fileName); ) \
 DEF_BENCH( return new LinearSrcOverBench<SrcOverVSkOptsDefault>(fileName); )
 #endif
 
 BENCHES("yellow_rose.png")
 BENCHES("baby_tux.png")
 BENCHES("plane.png")
 BENCHES("mandrill_512.png")
 BENCHES("iconstrip.png")