[fix][unittests][llvm] Fix running unit tests without assertions. [NFCI]

[VectorUtils] API for VFShape, update VFInfo.

Summary:
This patch introduces an API to build and modify vector shapes.

The validity of a VFShape can be checked with the
`hasValidParameterList` meth

[VectorUtils] API for VFShape, update VFInfo.

Summary:
This patch introduces an API to build and modify vector shapes.

The validity of a VFShape can be checked with the
`hasValidParameterList` method, which is also run in an assertion each
time a VFShape is modified.

The field VFISAKind has been moved to VFInfo under the assumption that
different ISAs can map to the same VFShape (as it can be in the case
of vector extensions with the same registers size, for example AVX and
AVX2).

Reviewers: sdesmalen, jdoerfert, simoll, hsaito

Subscribers: hiraditya, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D70513

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[Analysis] add isSplatValue() for vectors in IR

We have the related getSplatValue() already in IR (see code just above the proposed addition).
But sometimes we only need to know that the value is a

[Analysis] add isSplatValue() for vectors in IR

We have the related getSplatValue() already in IR (see code just above the proposed addition).
But sometimes we only need to know that the value is a splat rather than capture the splatted
scalar value. Also, we have an isSplatValue() function already in SDAG.

Motivation - recent bugs that would potentially benefit from improved splat analysis in IR:
https://bugs.llvm.org/show_bug.cgi?id=37428
https://bugs.llvm.org/show_bug.cgi?id=42174

Differential Revision: https://reviews.llvm.org/D63138

llvm-svn: 363106

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[Analysis] add unit test file for VectorUtils; NFC

llvm-svn: 362972