InstCombine: Move tests that use target intrinsics into subdirectories

Tests with target intrinsics are inherently target specific, so it
doesn't actually make sense to run them if we've excluded their
target.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@302979 91177308-0d34-0410-b5e6-96231b3b80d8
39 files changed