02984cf61b
This change introduces basic folding of casts and unary ops as they are created this is needed in order to allow later codegen pieces, such as builtin handlers, to more easily identify and examine constant operands. For example, many X86 builtin functions use a default mask operand of -1, which was previously generated as a constant 1 and a unary minus. In some cases, the folding process leaves behind unused constant operations, so I am also added a simple change to the canonicalize pass to remove unused constants. We had other places where unused constants were being generated already, and this change cleans those up too.
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