[llvm] [indvars] Missing variables at Og: (PR #69920)

[Carlos Alberto Enciso via llvm-commits]

CarlosAlbertoEnciso wrote:

I am sorry for my delay in addressing the comments from the reviewers, but I was on PTO.
The reworked patch addresses the issues and includes 2 test cases:
- Multiple exit blocks
- Single exit block.

https://github.com/llvm/llvm-project/pull/69920