disable linear pipeline for now (so bots don't crash)

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1766813002

TBR=

Review URL: https://codereview.chromium.org/1766813002

src/core/SkBitmapProcShader.cpp

@@ -226,6 +226,11 @@ SkShader::Context* SkBitmapProcShader::MakeContext(const SkShader& shader,
         useLinearPipeline = false;
     }
 
+    //
+    // For now, only enable locally since we are hitting some crashers on the test bots
+    //
+    useLinearPipeline = false;
+
     if (useLinearPipeline) {
         void* infoStorage = (char*)storage + sizeof(LinearPipelineContext);
         SkBitmapProcInfo* info = new (infoStorage) SkBitmapProcInfo(provider, tmx, tmy);