Moved knowledge on masking shift operands to simplifier.

Rationale:
It is better to have a single place that simplifies shift
factors outside the 32-bit or 64-bit distance range, so
that other phases (induction variable analysis, loop optimizations,
etc.) do not have to know about that.

Test: test-art-target, test-art-host
Change-Id: Idfd90259cca085426cc3055eccb90f3c0976036b