This adds a `DialectInlinerInterface` to the Triton dialect. This, along
with a few other minor semantic changes, fixes our tests on call
instructions. Also added the option to provide use an "LLVM_SYSPATH"
environment variable to link against locally build of LLVM; this was
useful for debugging this issue.
- Fixed bugs on layout conversions for int1 data (we should use int8
internally for int1 data to prevent llvm from using vec<i1> which has
different semantics)
- Fixed semantics of some casts to bool in the frontend
Disabled modulo test (due to change in behavior for `frem` in nvptx
between llvm-11 and llvm-14) and bfloat16 (will require some work to
emulate in software similar to how it's done in `master`)
