[SystemZ] Fix codegen for _[u]128 intrinsics

PR #74625 introduced a regression in the code generated for the
following set of intrinsic:
  vec_add_u128, vec_addc_u128, vec_adde_u128, vec_addec_u128
  vec_sub_u128, vec_subc_u128, vec_sube_u128, vec_subec_u128
  vec_sum_u128, vec_msum_u128
  vec_gfmsum_128, vec_gfmsum_accum_128

This is because the new code incorrectly assumed that a cast
from "unsigned __int128" to "vector unsigned char" would simply
be a bitcast re-interpretation; instead, this cast actually
truncates the __int128 to char and splats the result.

Fixed by adding an intermediate cast via a single-element
128-bit integer vector.

Fixes: https://github.com/llvm/llvm-project/issues/109113

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