[RISCV] Match strided loads with reversed indexing sequences

This extends the concat_vector of loads to strided_load transform to handle reversed index pattern. The previous code expected indexing of the form (a0, a1+S, a2+S,...). However, we can also see indexing of the form (a1+S, a2+S, a3+S, .., aS). This form is a strided load starting at address aN + S*(n-1) with stride -S.

Note that this is also fixing what looks to be a bug in the memory location reasoning for forward strided case. A strided load with negative stride access eltsize bytes past base ptr, and then bytes *before* base ptr. (That is, the range should extend from before base ptr to after base ptr.)

Differential Revision: https://reviews.llvm.org/D157886