cranelift: Remove booleans (#5031)

Remove the boolean types from cranelift, and the associated instructions breduce, bextend, bconst, and bint. Standardize on using 1/0 for the return value from instructions that produce scalar boolean results, and -1/0 for boolean vector elements.

Fixes #3205

Co-authored-by: Afonso Bordado <afonso360@users.noreply.github.com>
Co-authored-by: Ulrich Weigand <ulrich.weigand@de.ibm.com>
Co-authored-by: Chris Fallin <chris@cfallin.org>

cranelift/fuzzgen/src/lib.rs

@@ -129,7 +129,6 @@ where
                 };
                 DataValue::from_integer(imm, ty)?
             }
-            ty if ty.is_bool() => DataValue::B(bool::arbitrary(self.u)?),
             // f{32,64}::arbitrary does not generate a bunch of important values
             // such as Signaling NaN's / NaN's with payload, so generate floats from integers.
             F32 => DataValue::F32(Ieee32::with_bits(u32::arbitrary(self.u)?)),