[MLIR] Fix use-after-move in debug logging (#165208)
1. In `Transforms.cpp` the debug macro is accessing a SmallVector
variable that has been moved-from and reset. Fixed by reordering code
for the move-from to happen last.
2. `IterationGraphSorter` Refine the previous use-after-move fix for
style/readability by renaming the private constructor args to resolve
naming ambiguity with the class members.
Testing: `ninja check-mlir`
