[SLP]Moved NVPTX test under NVPTX directory, NFC.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@350969 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/test/Transforms/SLPVectorizer/X86/non-vectorizable-intrinsic.ll b/test/Transforms/SLPVectorizer/NVPTX/non-vectorizable-intrinsic.ll
similarity index 100%
rename from test/Transforms/SLPVectorizer/X86/non-vectorizable-intrinsic.ll
rename to test/Transforms/SLPVectorizer/NVPTX/non-vectorizable-intrinsic.ll