Add ARM to the denied club for KHR_blend_equation_advanced

Galaxy S20 is dropping draws that involve stencil. This hopefully
won't affect performance since these GPUs have fast framebuffer fetch
support.

Bug: skia:11906
Change-Id: I5d81e689e161bdf5cdc767439561172bb6a4d311
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/401042
Auto-Submit: Chris Dalton <csmartdalton@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
diff --git a/src/gpu/gl/GrGLCaps.cpp b/src/gpu/gl/GrGLCaps.cpp
index eab35c6..107adc3 100644
--- a/src/gpu/gl/GrGLCaps.cpp
+++ b/src/gpu/gl/GrGLCaps.cpp
@@ -3875,7 +3875,8 @@
         kAdreno530_GrGLRenderer == ctxInfo.renderer() ||
         kAdreno5xx_other_GrGLRenderer == ctxInfo.renderer() ||
         kIntel_GrGLDriver == ctxInfo.driver() ||
-        kChromium_GrGLDriver == ctxInfo.driver()) {
+        kChromium_GrGLDriver == ctxInfo.driver() ||
+        kARM_GrGLVendor == ctxInfo.vendor() /* http://skbug.com/11906 */) {
         fBlendEquationSupport = kBasic_BlendEquationSupport;
         shaderCaps->fAdvBlendEqInteraction = GrShaderCaps::kNotSupported_AdvBlendEqInteraction;
     }