[SystemZ][z/OS][libcxx] mark aligned allocation tests XFAIL on z/OS (#80735)

zOS doesn't support aligned allocation, so mark these testcases as
unsupported.

Continuation of https://reviews.llvm.org/D102798

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

@@ -9,6 +9,10 @@
 // UNSUPPORTED: no-exceptions
 // UNSUPPORTED: sanitizer-new-delete
 
+// Libc++ when built for z/OS doesn't contain the aligned allocation functions,
+// nor does the dynamic library shipped with z/OS.
+// XFAIL: target={{.+}}-zos{{.*}}
+
 #include <new>
 #include <cassert>
 #include <limits>

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

@@ -9,6 +9,10 @@
 // UNSUPPORTED: no-exceptions
 // UNSUPPORTED: sanitizer-new-delete
 
+// Libc++ when built for z/OS doesn't contain the aligned allocation functions,
+// nor does the dynamic library shipped with z/OS.
+// XFAIL: target={{.+}}-zos{{.*}}
+
 #include <new>
 #include <cassert>
 #include <limits>

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

@@ -9,6 +9,10 @@
 // UNSUPPORTED: no-exceptions
 // UNSUPPORTED: sanitizer-new-delete
 
+// Libc++ when built for z/OS doesn't contain the aligned allocation functions,
+// nor does the dynamic library shipped with z/OS.
+// XFAIL: target={{.+}}-zos{{.*}}
+
 #include <new>
 #include <cassert>
 #include <limits>

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

@@ -9,6 +9,10 @@
 // UNSUPPORTED: no-exceptions
 // UNSUPPORTED: sanitizer-new-delete
 
+// Libc++ when built for z/OS doesn't contain the aligned allocation functions,
+// nor does the dynamic library shipped with z/OS.
+// XFAIL: target={{.+}}-zos{{.*}}
+
 #include <new>
 #include <cassert>
 #include <limits>