Because most of tests assume target-abi=`lp64d`, adding the
corresponding feature is reasonable.
rg -l loongarch -g '!*.s' | xargs sed -i '/mtriple=loongarch/ {/-mattr=/!{/target-abi/! s/mtriple=loongarch.. /&-mattr=+d /}}'
If not performing gep splits can prevent important optimizations, such
as preventing the element indices / member offsets from being
(partially) folded into load/store instruction immediates.