Write ELF image and instantiate code_memory from it (#1931)

- Create the ELF image from Compilation
- Create CodeMemory from the ELF image
- Link using ELF image
- Remove creation of GDB JIT images from crates/debug
- Move make_trampoline from compiler.rs

crates/jit/src/lib.rs

@@ -26,6 +26,7 @@ mod compiler;
 mod imports;
 mod instantiate;
 mod link;
+mod object;
 mod resolver;
 mod unwind;
 
@@ -33,7 +34,7 @@ pub mod native;
 pub mod trampoline;
 
 pub use crate::code_memory::CodeMemory;
-pub use crate::compiler::{make_trampoline, Compilation, CompilationStrategy, Compiler};
+pub use crate::compiler::{Compilation, CompilationStrategy, Compiler};
 pub use crate::instantiate::{CompiledModule, SetupError};
 pub use crate::link::link_module;
 pub use crate::resolver::{NullResolver, Resolver};