[llvm] [llvm-cxxfilt] Add --quote option to quote demangled function names (PR #111871)

[James Henderson via llvm-commits]

================
@@ -1,12 +1,21 @@
-// Show that llvm-cxxfilt --quote can emit quoted demangled symbols but not
-// without double-quoting in the case they are already quoted
+// Show that llvm-cxxfilt --quote can emit quoted demangled symbols (even at the
+// end of a line) but not without double-quoting in the case they are already
+// quoted.
----------------
jh7370 wrote:

The phrasing here is a bit of a mouthful. How about this suggestion.
```suggestion
// Show that llvm-cxxfilt --quote adds quotes around demangled symbols, unless the symbol is already quoted.
```
(with appropriate line wrapping)

https://github.com/llvm/llvm-project/pull/111871