[LV] Move test for r343954 into x86 subdirectory

This test uses an x86 triple, so it needs to be in the x86 specific
test directory.

llvm-svn: 344087

diff --git a/llvm/test/Transforms/LoopVectorize/pr39160.ll b/llvm/test/Transforms/LoopVectorize/X86/pr39160.ll
similarity index 100%
rename from llvm/test/Transforms/LoopVectorize/pr39160.ll
rename to llvm/test/Transforms/LoopVectorize/X86/pr39160.ll