Mark one crasher test as fixed on OS X

Author: gribozavr

validation-test/compiler_crashers/23639-llvm-jit-runfunction.runtime.swift renamed to validation-test/compiler_crashers_fixed/23639-llvm-jit-runfunction.runtime.swift

@@ -1,8 +1,11 @@
-// RUN: not --crash %target-swift-frontend %s -emit-silgen
+// RUN: %target-swift-frontend %s -emit-silgen
 // Distributed under the terms of the MIT license
 // Test case submitted to project by https://github.com/practicalswift (practicalswift)
 // http://www.openradar.me/19423783
 
+// This test crashes on Linux.
+// XFAIL: linux
+
 protocol A {
     var a: Int {
         get