[Bug target/106097] undefined behaviors regarding integer shifts in loongarch_build_integer

[chenglulu at loongson dot cn]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106097

--- Comment #9 from chenglulu <chenglulu at loongson dot cn> ---
Created attachment 53206
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=53206&action=edit
use LU52I_B and LU32I_B instead of hard coding those long