[X86][AVX512] Add simple tests for all AVX512 shuffle instructions.
Throughout an effort to strongly check the behavior of CodeGen with the IR shufflevector instruction we generated many tests while predicting the best X86 sequence that may be generated.
This is a subset of the generated tests that we think may add value to our X86 set of tests.
Some of the checks are not optimal and will be changed after fixing:
1. PR34394
2. PR34382
3. PR34380
4. PR34359
Differential Revision: https://reviews.llvm.org/D37329
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@312442 91177308-0d34-0410-b5e6-96231b3b80d8
13 files changed