simplify-rtx: Simplify `(zero_extend (and x CST))` -> (and (subreg x) CST)

simplify-rtx: Simplify `(zero_extend (and x CST))` -> (and (subreg x) CST)

This adds the simplification of a ZERO_EXTEND of an AND. This optimization
was already handled in combine via combine_simplify_rtx and the handling
there of compound_operations (ZERO_EXTRACT).

Build and tested for aarch64-linux-gnu.
Bootstrapped and tested on x86_64-linux-gnu.

gcc/ChangeLog:

	* simplify-rtx.cc (simplify_context::simplify_unary_operation_1) <case ZERO_EXTEND>:
	Add simplifcation for and with a constant.

Signed-off-by: Andrew Pinski <quic_apinski@quicinc.com>