[X86] Remove sse4.2 intrinsic tests from the avx intrinsics test file. Fix some other consistency issues.

They are all covered by the SSE4.2 intrinsics test with SSE4.2, AVX, and AVX512 command lines.

Merge sse42.ll into the other intrinsics test. Rename sse42_64.ll to be named like other intrinsic tests.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@295707 91177308-0d34-0410-b5e6-96231b3b80d8
5 files changed