Revert r184787: "Added arm_neon intrinsic tests."

This test doesn't actually pass when run with llvm-lit for me or in
a bot that actually always tries to run it.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@184817 91177308-0d34-0410-b5e6-96231b3b80d8
Revert "Use the new PathV2 instead of implementing the logic in clang."

This reverts commit 184803 while I debug the failures on the bots.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@184818 91177308-0d34-0410-b5e6-96231b3b80d8