[compiler-rt] [NFC][sanitizer] Remove DTLS_on_libc_memalign (PR #108120)

[Thurston Dang via llvm-commits]

https://github.com/thurstond commented:

If the glibc <= 2.24 case will be handled by GetDTLSRange:
```
static bool GetDTLSRange(uptr &tls_beg, uptr &tls_size) {
...
  VReport(2, "__tls_get_addr: glibc >=2.25 suspected; tls={%p,0x%zx}\n",
          (void *)tls_beg, tls_size);
```
the comment needs updating.

https://github.com/llvm/llvm-project/pull/108120