Reduce number of `select` instruction variants by lowering negations

[Robbepop]

Negating a select instruction can make use of simply switching the true_value and false_value parameters.
However, the Wasmi translation does not really make use of this since its last select instruction overhaul.

With this we can

• Eliminate negate float compare variants such as select_f{32,64}_not_{le,lt}. (x4)
• Elimiante bitwise negate compare variants such as select_i{32,64}_{nand,nor,xnor}. (x12)
• Eliminate immediate-lhs compare variants such as select_i{32,64}_{le,lt}_{s,u}_imm16_lhs. (x8)
• Eliminate generic not-equal variants such as select_{i32,i64,f32,f64}_ne. (x6)

In total we can remove 30 select instruction variants.