Move all trampoline compilation to wasmtime-cranelift (#3176)

* Move all trampoline compilation to `wasmtime-cranelift`

This commit moves compilation of all the trampolines used in wasmtime
behind the `Compiler` trait object to live in `wasmtime-cranelift`. The
long-term goal of this is to enable depending on cranelift *only* from
the `wasmtime-cranelift` crate, so by moving these dependencies we
should make that a little more flexible.

* Fix windows build

crates/lightbeam/wasmtime/src/lib.rs

@@ -9,7 +9,7 @@ use cranelift_codegen::isa;
 use lightbeam::{CodeGenSession, NullOffsetSink, Sinks};
 use wasmtime_environ::wasm::{
     DefinedFuncIndex, DefinedGlobalIndex, DefinedMemoryIndex, DefinedTableIndex, FuncIndex,
-    GlobalIndex, MemoryIndex, TableIndex, TypeIndex,
+    GlobalIndex, MemoryIndex, TableIndex, TypeIndex, WasmFuncType,
 };
 use wasmtime_environ::{
     BuiltinFunctionIndex, CompileError, CompiledFunction, Compiler, FunctionBodyData, Module,
@@ -75,6 +75,23 @@ impl Compiler for Lightbeam {
             jt_offsets: Default::default(),
         })
     }
+
+    fn host_to_wasm_trampoline(
+        &self,
+        _isa: &dyn isa::TargetIsa,
+        _ty: &WasmFuncType,
+    ) -> Result<CompiledFunction, CompileError> {
+        unimplemented!()
+    }
+
+    fn wasm_to_host_trampoline(
+        &self,
+        _isa: &dyn isa::TargetIsa,
+        _ty: &WasmFuncType,
+        _host_fn: usize,
+    ) -> Result<CompiledFunction, CompileError> {
+        unimplemented!()
+    }
 }
 
 /// Implementation of a relocation sink that just saves all the information for later