[libc++][AIX][test] Remove XFAIL for libcpp_deallocate.sh.cpp

[ZarkoCA]

Summary

After https://reviews.llvm.org/rGa61b202d4e3b00bf6bfd71dc1ea354d37f73b791
this test now passes on AIX

[daltenty]

LGTM, but we'll need to update the build compiler with the fix as well to get the CI to pass

[Mordante]

LGTM from the libc++ side.

In D129701#3653562, @daltenty wrote:

LGTM, but we'll need to update the build compiler with the fix as well to get the CI to pass

But please make sure this is done and the CI is green before landing this patch.

[ZarkoCA]

Looks like I was beat to committing this by https://github.com/llvm/llvm-project/commit/9566c4a682065105a653c4c148325671755faace. Abandoning since the change is already in.

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

 //===----------------------------------------------------------------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 
 // test libc++'s implementation of align_val_t, and the relevant new/delete
 // overloads in all dialects when -faligned-allocation is present.
 
-// XFAIL: LIBCXX-AIX-FIXME
-
 // The dylibs shipped before macosx10.13 do not contain the aligned allocation
 // functions, so trying to force using those with -faligned-allocation results
 // in a link error.
 // XFAIL: use_system_cxx_lib && target={{.+}}-apple-macosx10.{{9|10|11|12}}
 
 // Libcxx when built for z/OS doesn't contain the aligned allocation functions,
 // nor does the dynamic library shipped with z/OS.
 // UNSUPPORTED: target={{.+}}-zos{{.*}}