[GlobalISel] Remove AssumptionCacheTracker from O0 pipeline (#195031)
This is for an optimizer hint that shouldn't be necessary at O0. Small
-0.09% compile time improvement on aarch64-O0-g.
https://llvm-compile-time-tracker.com/compare.php?from=4e6d3722fca73c97367720180a8d547057fda380&to=95b13462d4ff97f3fe5542e3eede0ad029a635f3&stat=instructions%3Au