Merge pull request #420 from nathawes/remove-fixed-stress-tester-xfail

[run_sk_stress_test] Updates xfails

Author: Nathan Hawes

sourcekit-xfails.json

@@ -589,18 +589,6 @@
     ],
     "issueUrl" : "https://bugs.swift.org/browse/SR-9371"
   },
-  {
-    "path" : "*\/Guitar\/Sources\/GuitarPadding.swift",
-    "modification" : "concurrent-2985",
-    "issueDetail" : {
-      "kind" : "cursorInfo",
-      "offset" : 2473
-    },
-    "applicableConfigs" : [
-      "master"
-    ],
-    "issueUrl" : "https://bugs.swift.org/browse/SR-12490"
-  },
   {
     "path" : "*\/IBAnimatable\/Sources\/ActivityIndicators\/Animations\/ActivityIndicatorAnimationCirclePendulum.swift",
     "issueDetail" : {