Fold fcvt_low_from_uinit into previously existing clif instructions

cranelift/codegen/meta/src/shared/instructions.rs

@@ -4457,28 +4457,6 @@ pub(crate) fn define(
         .operands_out(vec![a]),
     );
 
-    ig.push(
-        Inst::new(
-            "fcvt_low_from_uint",
-            r#"
-
-        Converts packed unsigned 32-bit integers to packed double precision floating point.
-
-        Considering only the low half of the register, each lane in `x` is interpreted as a
-        unsigned 32-bit integer that is then converted to a double precision float. This
-        instruction differs from fcvt_from_uint in that it converts half the number of lanes
-        which are converted to occupy twice the number of bits. No rounding should be needed
-        for the resulting float.
-
-        The result type will have half the number of vector lanes as the input.
-
-        "#,
-            &formats.unary,
-        )
-        .operands_in(vec![x])
-        .operands_out(vec![a]),
-    );
-
     let WideInt = &TypeVar::new(
         "WideInt",
         "An integer type with lanes from `i16` upwards",