[libc++][test] Updates sized deallocation tests. (llvm#97833)

In llvm#90373 size deallocation was enabled by default. Some test were
disabled to propagate the clang changes to the libc++ CI. These changes
have been propagated so the test filter can be updated.

libcxx/test/libcxx/language.support/support.dynamic/libcpp_deallocate.sh.cpp

@@ -21,8 +21,8 @@
 // GCC doesn't support the aligned-allocation flags.
 // XFAIL: gcc
 
-// TODO(mordante) fix this test after updating clang in Docker
-// UNSUPPORTED: clang-15, clang-16, clang-17, clang-18, clang-19
+// These compiler versions do not have proper sized deallocation support.
+// UNSUPPORTED: clang-17, clang-18
 
 // RUN: %{build} -faligned-allocation -fsized-deallocation
 // RUN: %{run}

libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.array/sized_delete_array14.pass.cpp

@@ -8,8 +8,9 @@
 
 // test sized operator delete[] replacement.
 
-// TODO(mordante) fix this test after updating clang in Docker
-// UNSUPPORTED: clang-15, clang-16, clang-17, clang-18, clang-19
+// These compiler versions do not have proper sized deallocation support.
+// UNSUPPORTED: clang-17, clang-18
+
 // UNSUPPORTED: sanitizer-new-delete, c++03, c++11
 // XFAIL: apple-clang
 // XFAIL: using-built-library-before-llvm-11

libcxx/test/std/language.support/support.dynamic/new.delete/new.delete.single/sized_delete14.pass.cpp

@@ -8,8 +8,9 @@
 
 // test sized operator delete replacement.
 
-// TODO(mordante) fix this test after updating clang in Docker
-// UNSUPPORTED: clang-15, clang-16, clang-17, clang-18, clang-19
+// These compiler versions do not have proper sized deallocation support.
+// UNSUPPORTED: clang-17, clang-18
+
 // UNSUPPORTED: sanitizer-new-delete, c++03, c++11
 // XFAIL: apple-clang
 // XFAIL: using-built-library-before-llvm-11