[llvm] [NFC] [DebugCounter] warn if --debug-counter is unused in NDEBUG (PR #143057)

[Nikita Popov via llvm-commits]

================
@@ -172,6 +172,11 @@ DebugCounter &DebugCounter::instance() {
 void DebugCounter::push_back(const std::string &Val) {
   if (Val.empty())
     return;
+#ifdef NDEBUG
+  // isCountingEnabled is hardcoded to false in NDEBUG.
+  errs() << "Requested --debug-counter in non-debug LLVM build. This is a "
----------------
nikic wrote:

```suggestion
  errs() << "Requested --debug-counter in LLVM build without assertions. This is a "
```

https://github.com/llvm/llvm-project/pull/143057