Merge pull request #20319 from nkcsgexi/rdar45797168

[test] disable SILOptimizer/unused_containers.swift to unblock CI. rdar://45797168

Author: nkcsgexi

test/SILOptimizer/unused_containers.swift

@@ -4,9 +4,9 @@
 
 // FIXME: https://bugs.swift.org/browse/SR-7806
 // REQUIRES: CPU=arm64 || CPU=x86_64
+// REQUIRES: rdar45797168
 
 // FIXME: https://bugs.swift.org/browse/SR-9008
-// XFAIL: linux
 
 //CHECK-LABEL: @$s17unused_containers16empty_array_testyyF
 //CHECK: bb0: