[1/6][Clang][RISCV] Replace unit-stride (fault-first) segment load with tuple type interfaces

Depends on D152079.

This patch-set aims to replace the existing segment load/store
intrinsics with tuple-type segment load/store intrinsics. That is, we
are removing in the segment load/store intrinsics.

This is the 1st commit of the patch-set.

This patch makes the unit-stride segment load intrinsics and
unit-stride fault-first segment load intrinsics to use tuple
types.

Reviewed By: rogfer01

Differential Revision: https://reviews.llvm.org/D152134