[lld] [ELF] Add --compress-nonalloc-section (PR #84855)

[Petr Hosek via llvm-commits]

================
@@ -450,20 +470,18 @@ void OutputSection::writeTo(uint8_t *buf, parallel::TaskGroup &tg) {
   if (type == SHT_NOBITS)
     return;
 
-  // If --compress-debug-section is specified and if this is a debug section,
-  // we've already compressed section contents. If that's the case,
-  // just write it down.
+  // If the section is compressed due to
+  // --compress-debug-section/--compress-sections, the content is already known.
----------------
petrhosek wrote:

```suggestion
  // --compress-debug-section/--compress-nonalloc-sections, the content is already known.
```

https://github.com/llvm/llvm-project/pull/84855