Merge wasmtime-jit and wasmtime-profiling (#3247)

* Merge `wasmtime-jit` and `wasmtime-profiling`

This commit merges the `wasmtime-profiling` crate into the
`wasmtime-jit` crate. It wasn't really buying a ton being a separate
crate and an upcoming refactoring I'd like to do is to remove the
`FinishedFunctions` structure. To enable the profilers to work as they
used to this commit changes them to pass `CompiledModule` as the
argument, but this only works if the profiling trait can see the
`CompiledModule` type.

* Fix a length calculation

crates/jit/src/lib.rs

@@ -24,6 +24,7 @@ mod code_memory;
 mod debug;
 mod instantiate;
 mod link;
+mod profiling;
 mod unwind;
 
 pub use crate::code_memory::CodeMemory;
@@ -31,6 +32,7 @@ pub use crate::instantiate::{
     CompilationArtifacts, CompiledModule, ModuleCode, SetupError, SymbolizeContext, TypeTables,
 };
 pub use crate::link::link_module;
+pub use profiling::*;
 
 /// Version number of this crate.
 pub const VERSION: &str = env!("CARGO_PKG_VERSION");