Move cranelift dependencies to wasmtime-environ (#669)

Groups all CL data structures into single dependency to be used accross wasmtime project.

crates/obj/src/context.rs

@@ -1,12 +1,12 @@
 #![allow(clippy::cast_ptr_alignment)]
 
-use cranelift_codegen::isa::TargetFrontendConfig;
-use cranelift_entity::EntityRef;
-use cranelift_wasm::GlobalInit;
 use more_asserts::assert_le;
 use std::collections::hash_map::Entry;
 use std::collections::HashMap;
 use std::ptr;
+use wasmtime_environ::entity::EntityRef;
+use wasmtime_environ::isa::TargetFrontendConfig;
+use wasmtime_environ::wasm::GlobalInit;
 use wasmtime_environ::{Module, TargetSharedSignatureIndex, VMOffsets};
 
 pub struct TableRelocation {

crates/obj/src/function.rs

@@ -1,7 +1,7 @@
-use cranelift_codegen::settings;
-use cranelift_codegen::settings::Configurable;
-use cranelift_entity::EntityRef;
 use faerie::{Artifact, Decl, Link};
+use wasmtime_environ::entity::EntityRef;
+use wasmtime_environ::settings;
+use wasmtime_environ::settings::Configurable;
 use wasmtime_environ::{Compilation, Module, RelocationTarget, Relocations};
 
 fn get_reloc_target_special_import_name(target: RelocationTarget) -> Option<&'static str> {

crates/obj/src/module.rs

@@ -2,8 +2,8 @@ use crate::context::layout_vmcontext;
 use crate::data_segment::{declare_data_segment, emit_data_segment};
 use crate::function::{declare_functions, emit_functions};
 use crate::table::{declare_table, emit_table};
-use cranelift_codegen::isa::TargetFrontendConfig;
 use faerie::{Artifact, Decl, Link};
+use wasmtime_environ::isa::TargetFrontendConfig;
 use wasmtime_environ::{Compilation, DataInitializer, Module, Relocations};
 
 fn emit_vmcontext_init(