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/Cargo.toml

@@ -30,6 +30,7 @@ anyhow = "1.0"
 cfg-if = "0.1.9"
 log = "0.4"
 gimli = { version = "0.21.0", default-features = false, features = ["write"] }
+object = { version = "0.20", default-features = false, features = ["write"] }
 
 [target.'cfg(target_os = "windows")'.dependencies]
 winapi = { version = "0.3.8", features = ["winnt", "impl-default"] }