Implement kernel analysis for functions with multiple return values (#119615)
This diff adds few improvements:
* Parsing for multiple return value: `tt.return %1, %arg0`
* Parsing for assignment for multiple values: `%1:2` means %1 has two values
* Parsing for usage of a value with multiple values: `%1#0` means 0th index of %1
* Fixes a bug in memo-cycle detection when multiple tests are executed back to back
Pull Request resolved: https://github.com/pytorch/pytorch/pull/119615
Approved by: https://github.com/aakhundov
ghstack dependencies: #119581
