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

[eopXD]

Summary

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.

[eopXD]

Rebase to latest main.

[kito-cheng]

clang/include/clang/Support/RISCVVIntrinsicUtils.h

398

Drop const for parameter, you don't need const qualifier for those primitive types on the parameter list.

480

Same here.

clang/lib/Sema/SemaRISCVVectorLookup.cpp

152

Ditto.

clang/lib/Support/RISCVVIntrinsicUtils.cpp

851

Ditto.

1015

Ditto.

[kito-cheng]

Wait, I fell HasTailPolicy and HasMaskPolicy should be part of Policy object, and then it's the Omit to present it's no policy.

[craig.topper]

LGTM

[craig.topper]

Oops I didn't mean to approve this with Kito's comments outstanding.

[eopXD]

Address comment from Kito.

[eopXD]

Update code.

[eopXD]

In D141754#4057829, @kito-cheng wrote:

Wait, I fell HasTailPolicy and HasMaskPolicy should be part of Policy object, and then it's the Omit to present it's no policy.

I think the simplification here https://reviews.llvm.org/D142016#inline-1372027 should resolve your concern.

[kito-cheng]

LGTM

[craig.topper]

LGTM