cranelift: Introduce a feature to enable trace logs (#4484)

* Don't use `log::trace` directly but a feature-enabled `trace` macro
* Don't emit disassembly based on the log level

cranelift/codegen/src/isa/x64/inst/emit.rs

@@ -2789,7 +2789,7 @@ pub(crate) fn emit(
         }
 
         Inst::VirtualSPOffsetAdj { offset } => {
-            log::trace!(
+            trace!(
                 "virtual sp offset adjusted by {} -> {}",
                 offset,
                 state.virtual_sp_offset + offset