[5/15][Clang][RISCV][NFC] Remove extra attribute Policy::IntrinsicWithoutMU by...

[5/15][Clang][RISCV][NFC] Remove extra attribute Policy::IntrinsicWithoutMU by reusing HasTailPolicy and HasMaskPolicy

Righteously there shouldn't be any special cases here because
`HasTailPolicy` and `HasMaskPolicy` is able to express necessary cases.
This commit is a part of the step-by-step effort to remove
`Policy::Scheme::Omit`, which completely does not make sense in RVV 1.0
because an RVV instruction always executes with `vta` and `vma` set
to a certain value.

This is the 5th commit of a patch-set that aims to change the default policy
for RVV intrinsics from TAMU to TAMA.

Please refer to the cover letter in the 1st commit (D141573) for an
overview.

Reviewed By: craig.topper, kito-cheng

Differential Revision: https://reviews.llvm.org/D141754