[AArch64] Fixes for BigEndian 128bit volatile, atomic and non-temporal loads/stores

This fixes up the generation of 128bit atomic, volatile and non-temporal
loads/stores, under the assumption that they should usually be the same as
standard versions.
https://godbolt.org/z/xxc89eMKE

Fixes #64580
Closes #67413

GitOrigin-RevId: 1610311a95b1a98f47e9242d67141c5b3e44a138
9 files changed