Move cranelift dependencies to wasmtime-environ (#669)

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

crates/debug/src/transform/unit.rs

@@ -6,10 +6,10 @@ use super::range_info_builder::RangeInfoBuilder;
 use super::utils::{add_internal_types, append_vmctx_info, get_function_frame_info};
 use super::{DebugInputContext, Reader, TransformError};
 use anyhow::Error;
-use cranelift_entity::EntityRef;
 use gimli::write;
 use gimli::{AttributeValue, DebuggingInformationEntry, Unit, UnitOffset};
 use std::collections::{HashMap, HashSet};
+use wasmtime_environ::entity::EntityRef;
 use wasmtime_environ::{ModuleVmctxInfo, ValueLabelsRanges};
 
 pub(crate) type PendingDieRef = (write::UnitEntryId, gimli::DwAt, UnitOffset);