[SystemZ][z/OS] Set maximum value to truncate attribute aligned to for static...

[SystemZ][z/OS] Set maximum value to truncate attribute aligned to for static variables on z/OS target

On z/OS there is a hard limitation on on the maximum requestable alignment in aligned attribute for static variables. We need to truncate values greater than that.

Reviewed By: abhina.sreeskantharajan

Differential Revision: https://reviews.llvm.org/D98864