Handle another DWARF attribute when rewriting DWARF (#9335)

I don't know what `Data8` is, but it looks a lot like `Data4`, so
process it in the same way as `Data4`.

Closes #9333

crates/cranelift/src/debug/transform/attr.rs

@@ -100,6 +100,7 @@ where
             AttributeValue::Data1(d) => write::AttributeValue::Data1(d),
             AttributeValue::Data2(d) => write::AttributeValue::Data2(d),
             AttributeValue::Data4(d) => write::AttributeValue::Data4(d),
+            AttributeValue::Data8(d) => write::AttributeValue::Data8(d),
             AttributeValue::Sdata(d) => write::AttributeValue::Sdata(d),
             AttributeValue::Flag(f) => write::AttributeValue::Flag(f),
             AttributeValue::DebugLineRef(line_program_offset) => {