[PowerPC] Don't use a vector preferred memory type at -O0

[PowerPC] Don't use a vector preferred memory type at -O0

Even at -O0, we fall back to SDAG when we hit intrinsics, and if the intrinsic
is a memset/memcpy/etc. we might normally use vector types. At -O0, this is
probably not a good idea (because, if there is a bug in the lowering code,
there would be no good way to turn it off). At -O0, only use scalar preferred
types.

Related to PR22754.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@233755 91177308-0d34-0410-b5e6-96231b3b80d8