[AutoDiff][test] Enable some previously XFAIL'ed tests (swiftlang#84915)

In swiftlang#84704, some tests were XFAIL'ed since they've become failing. The
root cause of failures is lack of ownership info on the 2nd run of
AutoDiff closure specialization pass. Ownership info is required for the
pass run after swiftlang#84704, so at the moment only the 1st run of the pass is
effective.

Several test cases still remain passing because for some cases we are
lucky and all the inlining required for specialization is done before
the 1st pass run. This patch enables such test cases back so we have at
least some test coverage.

Author: kovdan01

test/AutoDiff/validation-test/closure_specialization/multi_bb_no_bte.swift

@@ -11,13 +11,18 @@
 // RUN: %target-run %t/opt.out
 
 // RUN: %target-swift-frontend -emit-sil %s -O -o %t/out.sil
-// RUN: cat %t/out.sil | %FileCheck %s --check-prefix=CHECK1
-// RUN: cat %t/out.sil | %FileCheck %s --check-prefix=CHECK2
-// RUN: cat %t/out.sil | %FileCheck %s --check-prefix=CHECK3
-// RUN: cat %t/out.sil | %FileCheck %s --check-prefix=CHECK4
 
-// TODO: re-enable this test once we have OSSA throughout the pipeline
-// XFAIL: *
+// TODO: Re-enable these tests once we have OSSA throughout the pipeline.
+//       AutoDiff Closure Specialization pass runs twice, but at the second
+//       run we currently do not perform any transformation because ownership
+//       eliminator is run before. Disabled tests below rely on the second
+//       pass run performing transformation, so they currently fail.
+//       https://github.com/swiftlang/swift/issues/84920
+// TODO: cat %t/out.sil | %FileCheck %s --check-prefix=CHECK1
+// TODO: cat %t/out.sil | %FileCheck %s --check-prefix=CHECK2
+// TODO: cat %t/out.sil | %FileCheck %s --check-prefix=CHECK3
+
+// RUN: cat %t/out.sil | %FileCheck %s --check-prefix=CHECK4
 
 import DifferentiationUnittest
 import StdlibUnittest

test/AutoDiff/validation-test/closure_specialization/single_bb2.swift

@@ -11,11 +11,16 @@
 // RUN: %target-run %t/opt.out
 
 // RUN: %target-swift-frontend -emit-sil %s -O -o %t/out.sil
-// RUN: cat %t/out.sil | %FileCheck %s --check-prefix=CHECK4
-// RUN: cat %t/out.sil | %FileCheck %s --check-prefix=CHECK5
 
-// TODO: re-enable this test once we have OSSA throughout the pipeline
-// XFAIL: *
+// TODO: Re-enable these tests once we have OSSA throughout the pipeline.
+//       AutoDiff Closure Specialization pass runs twice, but at the second
+//       run we currently do not perform any transformation because ownership
+//       eliminator is run before. Disabled tests below rely on the second
+//       pass run performing transformation, so they currently fail.
+//       https://github.com/swiftlang/swift/issues/84920
+// TODO: cat %t/out.sil | %FileCheck %s --check-prefix=CHECK4
+
+// RUN: cat %t/out.sil | %FileCheck %s --check-prefix=CHECK5
 
 import DifferentiationUnittest
 import StdlibUnittest