[AArch64] Remove AArch64AddressTypePromotion pass

Summary:
Remove the AArch64AddressTypePromotion pass as we migrated all transformations
done in this pass into CGP in r299379.

Reviewers: qcolombet, jmolloy, javed.absar, mcrosier

Reviewed By: qcolombet

Subscribers: aemerson, rengolin, mgorny, llvm-commits

Differential Revision: https://reviews.llvm.org/D31623

llvm-svn: 302245