Work around VS 2015 Update 3 optimizer internal compiler error

src/gpu/effects/GrConfigConversionEffect.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "GrConfigConversionEffect.h"
 #include "GrContext.h"
 #include "GrDrawContext.h"
@@ skipping 107 matching lines @@
 }
 
 void GrConfigConversionEffect::onComputeInvariantOutput(GrInvariantOutput* inout) const {
     this->updateInvariantOutputForModulation(inout);
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 
 GR_DEFINE_FRAGMENT_PROCESSOR_TEST(GrConfigConversionEffect);
 
+#if !defined(__clang__) && _MSC_FULL_VER >= 190024213
+// Work around VS 2015 Update 3 optimizer bug that causes internal compiler error
+//https://connect.microsoft.com/VisualStudio/feedback/details/3100520/internal-compiler-error
+#pragma optimize("t", off)
+#endif
+
 sk_sp<GrFragmentProcessor> GrConfigConversionEffect::TestCreate(GrProcessorTestData* d) {
     PMConversion pmConv = static_cast<PMConversion>(d->fRandom->nextULessThan(kPMConversionCnt));
     GrSwizzle swizzle;
     do {
         swizzle = GrSwizzle::CreateRandom(d->fRandom);
     } while (pmConv == kNone_PMConversion && swizzle == GrSwizzle::RGBA());
     return sk_sp<GrFragmentProcessor>(
         new GrConfigConversionEffect(d->fTextures[GrProcessorUnitTest::kSkiaPMTextureIdx],
                                      swizzle, pmConv, GrTest::TestMatrix(d->fRandom)));
 }
 
+#if !defined(__clang__) && _MSC_FULL_VER >= 190024213
+// Restore optimization settings.
+#pragma optimize("", on)
+#endif
+
 ///////////////////////////////////////////////////////////////////////////////
 
 void GrConfigConversionEffect::onGetGLSLProcessorKey(const GrGLSLCaps& caps,
                                                      GrProcessorKeyBuilder* b) const {
     GrGLConfigConversionEffect::GenKey(*this, caps, b);
 }
 
 GrGLSLFragmentProcessor* GrConfigConversionEffect::onCreateGLSLInstance() const {
     return new GrGLConfigConversionEffect();
 }
@@ skipping 116 matching lines @@
         if (kRGBA_8888_GrPixelConfig != texture->config() &&
             kBGRA_8888_GrPixelConfig != texture->config() &&
             kNone_PMConversion != pmConversion) {
             // The PM conversions assume colors are 0..255
             return nullptr;
         }
         return sk_sp<GrFragmentProcessor>(
             new GrConfigConversionEffect(texture, swizzle, pmConversion, matrix));
     }
 }