Revert "[AArch64][GlobalISel] Optimize conjunctions of compares to conditional compares."

This reverts commit 2a464508.

This triggers the following assertion in an internal project:

    Assertion failed: (VRegInfo[Reg.id()].first.is<const TargetRegisterClass
    *>() && "Register class not set, wrong accessor"), function getRegClass,
    file MachineRegisterInfo.h, line 646.

I'll work with the author directly to get a reproducer.