Remove pattern fragments for v32i8, v16i16, v8i32, v16i8, v8i16, and v4i32...

Remove pattern fragments for v32i8, v16i16, v8i32, v16i8, v8i16, and v4i32 loads. All integer vector loads are promoted to v2i64 or v4i64 so these pattern fragments can never match. Fix or remove patterns that used these fragments.

llvm-svn: 148672