[llvm] [llvm-dwarfdump][LineCov 1/3] Add variable coverage metrics (PR #169646)

[Stephen Tozer via llvm-commits]

================
@@ -193,6 +193,17 @@ OPTIONS
 
             The :option:`--debug-frame` and :option:`--eh-frame` options are aliases, in cases where both sections are present one command outputs both.
 
+.. option:: --show-variable-coverage
+
+            Show per-variable coverage metrics. The output format is described
+            in the section below (:ref:`variable-coverage-format`).
+
+.. option:: --combine-instances
----------------
SLTozer wrote:

```suggestion
.. option:: --combine-inline-variable-instances
```
Maybe this could be named something more detailed/descriptive, since it's a sub-option of the above.

https://github.com/llvm/llvm-project/pull/169646