Move cranelift dependencies to wasmtime-environ (#669)

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

crates/debug/src/lib.rs

@@ -3,10 +3,10 @@
 #![allow(clippy::cast_ptr_alignment)]
 
 use anyhow::Error;
-use cranelift_codegen::isa::TargetFrontendConfig;
 use faerie::{Artifact, Decl};
 use more_asserts::assert_gt;
 use target_lexicon::{BinaryFormat, Triple};
+use wasmtime_environ::isa::TargetFrontendConfig;
 use wasmtime_environ::{ModuleAddressMap, ModuleVmctxInfo, ValueLabelsRanges};
 
 pub use crate::read_debuginfo::{read_debuginfo, DebugInfoData, WasmFileInfo};