[llvm] [Passes] Enhance `--print-pipeline-passes` (PR #202892)

[Aiden Grossman via llvm-commits]

================
@@ -0,0 +1,13 @@
+; RUN: opt -p 'no-op-module' %s --filetype=null --disable-pipeline-verification --print-pipeline-passes | \
+; RUN: FileCheck %s --check-prefix=TEXT
+
+; RUN: opt -p 'no-op-module,function(no-op-function)' %s --filetype=null \
+; RUN: --disable-pipeline-verification --print-pipeline-passes=tree | \
----------------
boomanaiden154 wrote:

It's unclear to me why exactly verification would fail because of the existence of a path.

This command is not erroring out for me locally.
```
./bin/opt -p 'no-op-module,function(no-op-function)' /dev/null --filetype=null -S -print-pipeline-passes   ```

Prints the pipeline just fine for me:
```
no-op-module,function(no-op-function),verify,print
```

https://github.com/llvm/llvm-project/pull/202892