[llvm] [symbolizer] Empty string is not an error (PR #92660)

[James Henderson via llvm-commits]

================
@@ -337,6 +337,13 @@ static void symbolizeInput(const opt::InputArgList &Args,
   object::BuildID BuildID(IncomingBuildID.begin(), IncomingBuildID.end());
   uint64_t Offset = 0;
   StringRef Symbol;
+
+  // Empty input string may be used to check if the process is alive. Do not
----------------
jh7370 wrote:

```suggestion
  // An empty input string may be used to check if the process is alive and responding to input. Do not
```
(and reflow the comment as necessary)

https://github.com/llvm/llvm-project/pull/92660