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Chenggang Zhao f16138d447 [Frontend] Interface fixes for libdevice (#830 )

- Unifying several interfaces with different types to a single one, e.g.
`fsub_ru` and `dsub_ru` -> `sub_ru`;
- Minor bug fix: `fast_pow` is incorrectly classified into the `pow`
interface, of which arguments are the same as `powf`;
- Explicit interfaces for casting functions, e.g. decoupling
`ll2float_ru` to `ll2float_ru` and `ull2float_ru`;
- Removing interfaces that are not in NVIDIA's official documents, e.g.
`fmaf_ieee_rn`, which is confusing together with `fmaf_rn`.

Note that this PR for the master branch is different from #829, which is
for the MLIR branch.

2022-11-01 10:51:58 -07:00