[libcxx] [mlir] [llvm] [libc++][concepts] Implements concept helper `__libcpp_integer` (PR #78086)

[Hristo Hristov via llvm-commits]

H-G-Hristov wrote:

```
86\test\std\utilities\format\format.functions\Output\formatted_size.pass.cpp.dir\t.tmp.exe'
# .---command stderr------------
# | Traceback (most recent call last):
# |   File "C:\ws\src\libcxx\utils\run.py", line 72, in <module>
# |     exit(main())
# |   File "C:\ws\src\libcxx\utils\run.py", line 68, in main
# |     return subprocess.call(commandLine, cwd=args.execdir, env=env, shell=False)
# |   File "c:\python39\lib\subprocess.py", line 349, in call
# |     with Popen(*popenargs, **kwargs) as p:
# |   File "c:\python39\lib\subprocess.py", line 951, in __init__
# |     self._execute_child(args, executable, preexec_fn, close_fds,
# |   File "c:\python39\lib\subprocess.py", line 1420, in _execute_child
# |     hp, ht, pid, tid = _winapi.CreateProcess(executable, args,
# | OSError: [WinError 225] Operation did not complete successfully because the file contains a virus or potentially unwanted 
```

https://github.com/llvm/llvm-project/pull/78086