Remove some allocations in CodeMemory (#3253)

* Remove some allocations in `CodeMemory`

This commit removes the `FinishedFunctions` type as well as allocations
associated with trampolines when allocating inside of a `CodeMemory`.
The main goal of this commit is to improve the time spent in
`CodeMemory` where currently today a good portion of time is spent
simply parsing symbol names and trying to extract function indices from
them. Instead this commit implements a new strategy (different from #3236)
where compilation records offset/length information for all
functions/trampolines so this doesn't need to be re-learned from the
object file later.

A consequence of this commit is that this offset information will be
decoded/encoded through `bincode` unconditionally, but we can also
optimize that later if necessary as well.

Internally this involved quite a bit of refactoring since the previous
map for `FinishedFunctions` was relatively heavily relied upon.

* comments

crates/jit/src/profiling/vtune_linux.rs

@@ -121,7 +121,7 @@ impl State {
         let global_module_id = MODULE_ID.fetch_add(1, atomic::Ordering::SeqCst);
 
         for (idx, func) in module.finished_functions() {
-            let (addr, len) = unsafe { ((**func).as_ptr() as *const u8, (**func).len()) };
+            let (addr, len) = unsafe { ((*func).as_ptr() as *const u8, (*func).len()) };
             let default_filename = "wasm_file";
             let default_module_name = String::from("wasm_module");
             let module_name = module