Revert to enabling all of -O2 as it exposes a bug in the toolchain.

gm/resizeimagefilter.cpp

Index: gm/resizeimagefilter.cpp
diff --git a/gm/resizeimagefilter.cpp b/gm/resizeimagefilter.cpp
index e87dff0d35480a24d4b2eece45c9954e531f8f29..324d07cda2c54c500fa45e0de24c9a4a55fae15d 100644
--- a/gm/resizeimagefilter.cpp
+++ b/gm/resizeimagefilter.cpp
@@ -25,6 +25,13 @@ protected:
         return SkString("resizeimagefilter");
     }
 
+#ifdef SK_CPU_ARM64
+    // Skip tiled drawing on 64-bit ARM until https://skbug.com/2908 is fixed.
+    virtual uint32_t onGetFlags() const SK_OVERRIDE {
+        return this->INHERITED::onGetFlags() | GM::kSkipTiled_Flag;
+    }
+#endif
+
     void draw(SkCanvas* canvas,
               const SkRect& rect,
               const SkSize& deviceSize,