[AArch64][SVE] Move the testcase into CodeGen dir
[AArch64][SVE] Move the testcase into CodeGen dir

https://reviews.llvm.org/rL373600 added an AArch64 testcase in top dir
which should be moved to Codegen dir.

git-svn-id: 0ff597fd157e6f4fc38580e8d64ab130330d2411@373657 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/llvm,llvm-mirror/llvm,llvm-mirror/llvm,llvm-mirror/llvm,llvm-mirror/llvm,llvm-mirror/llvm,llvm-mirror/llvm,llvm-mirror/llvm,llvm-mirror/llvm