[PhaseOrdering] Move X86 unsigned-multiply-overflow-check.ll test under X86

diff --git a/llvm/test/Transforms/PhaseOrdering/unsigned-multiply-overflow-check.ll b/llvm/test/Transforms/PhaseOrdering/X86/unsigned-multiply-overflow-check.ll
similarity index 100%
rename from llvm/test/Transforms/PhaseOrdering/unsigned-multiply-overflow-check.ll
rename to llvm/test/Transforms/PhaseOrdering/X86/unsigned-multiply-overflow-check.ll