Work around VS 2015 Update 3 optimizer internal compiler error

src/gpu/effects/GrConfigConversionEffect.cpp

Index: src/gpu/effects/GrConfigConversionEffect.cpp
diff --git a/src/gpu/effects/GrConfigConversionEffect.cpp b/src/gpu/effects/GrConfigConversionEffect.cpp
index 2808af638f3d7df98bbabce5724ac1d10ac89510..aeb0393daf7a693830fa0e0d3118f2b5932a383f 100644
--- a/src/gpu/effects/GrConfigConversionEffect.cpp
+++ b/src/gpu/effects/GrConfigConversionEffect.cpp
@@ -125,6 +125,12 @@ void GrConfigConversionEffect::onComputeInvariantOutput(GrInvariantOutput* 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;
@@ -136,6 +142,11 @@ sk_sp<GrFragmentProcessor> GrConfigConversionEffect::TestCreate(GrProcessorTestD
                                      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,