a few ignores for nvprmsaa4

expectations/gm/Test-Win8-ShuttleA-GTX660-x86_64-Debug/expected-results.json

 {
   "expected-results": {
     "3x3bitmaprect_565.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           12831071530564277917
         ]
       ], 
       "bugs": [
@@ skipping 18666 matching lines @@
       ], 
       "reviewed-by-human": true
     }, 
     "shadertext_nvprmsaa4.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           16258109186950173986
         ]
       ], 
+      "ignore-failure": true,
       "reviewed-by-human": true
     }, 
     "shadertext_pdf-poppler.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           8604342528351069052
         ]
       ], 
       "bugs": [
@@ skipping 3220 matching lines @@
     "yuv_to_rgb_effect_nvprmsaa4.png": {
       "allowed-digests": [
         [
           "bitmap-64bitMD5", 
           11835374726311942978
         ]
       ], 
       "reviewed-by-human": true
     }
   }
-}
+}