[llvm] [flang][runtime] Allow some list-directed child output to advance (PR #166847)

[Daniel Chen via llvm-commits]

DanielCChen wrote:

The reduced test case is fixed as well as the corresponding portion of the full test case. 
Thanks!

However, the full test case still fails probably due to a different variation.
I will open a new issue to track it.

https://github.com/llvm/llvm-project/pull/166847