Expression folding on expressions with register on RHS

Currently expression folding looks for operations such as:

x = y op c1
z = x op c2

where c1 and c2 are constants. However, in some cases we can fold registers on the RHS, for example:

x = y & a
z = x & a

can become:

z = y & a

also:

x = y / a
z = x / b

can become:

t = a * b
z = y / t

This replaces SF RFE tracker #1700396.

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