Merge pull request #20538 from benlangmuir/disable-DiagsAfterCloseAndReopen

[sourcekit] Disable DiagsAfterCloseAndReopen test (again)
diff --git a/unittests/SourceKit/SwiftLang/EditingTest.cpp b/unittests/SourceKit/SwiftLang/EditingTest.cpp
index 7fafc25..2294f17 100644
--- a/unittests/SourceKit/SwiftLang/EditingTest.cpp
+++ b/unittests/SourceKit/SwiftLang/EditingTest.cpp
@@ -266,7 +266,8 @@
   close(DocName);
 }
 
-TEST_F(EditTest, DiagsAfterCloseAndReopen) {
+// This test is failing occassionally in CI: rdar://45644449
+TEST_F(EditTest, DISABLED_DiagsAfterCloseAndReopen) {
   // Attempt to open the same file twice in a row. This tests (subject to
   // timing) cases where:
   // * the 2nd open happens before the first AST starts building