Remove some dead code in the cranelift-wasm crate (#5290)

* Remove some dead code in the cranelift-wasm crate

* Remove some more dead code

cranelift/wasm/src/state/module_state.rs

@@ -1,8 +1,6 @@
-use crate::{SignatureIndex, WasmError, WasmResult};
-use cranelift_codegen::ir::{types, Type};
+use crate::SignatureIndex;
 use cranelift_entity::PrimaryMap;
 use std::boxed::Box;
-use std::vec::Vec;
 
 /// Map of signatures to a function's parameter and return types.
 pub(crate) type WasmTypes =
@@ -23,22 +21,6 @@ pub struct ModuleTranslationState {
     pub(crate) wasm_types: WasmTypes,
 }
 
-fn cranelift_to_wasmparser_type(ty: Type) -> WasmResult<wasmparser::ValType> {
-    Ok(match ty {
-        types::I32 => wasmparser::ValType::I32,
-        types::I64 => wasmparser::ValType::I64,
-        types::F32 => wasmparser::ValType::F32,
-        types::F64 => wasmparser::ValType::F64,
-        types::R32 | types::R64 => wasmparser::ValType::ExternRef,
-        _ => {
-            return Err(WasmError::Unsupported(format!(
-                "Cannot convert Cranelift type to Wasm signature: {:?}",
-                ty
-            )));
-        }
-    })
-}
-
 impl ModuleTranslationState {
     /// Creates a new empty ModuleTranslationState.
     pub fn new() -> Self {
@@ -46,24 +28,4 @@ impl ModuleTranslationState {
             wasm_types: PrimaryMap::new(),
         }
     }
-
-    /// Create a new ModuleTranslationState with the given function signatures,
-    /// provided in terms of Cranelift types. The provided slice of signatures
-    /// is indexed by signature number, and contains pairs of (args, results)
-    /// slices.
-    pub fn from_func_sigs(sigs: &[(&[Type], &[Type])]) -> WasmResult<Self> {
-        let mut wasm_types = PrimaryMap::with_capacity(sigs.len());
-        for &(ref args, ref results) in sigs {
-            let args: Vec<wasmparser::ValType> = args
-                .iter()
-                .map(|&ty| cranelift_to_wasmparser_type(ty))
-                .collect::<Result<_, _>>()?;
-            let results: Vec<wasmparser::ValType> = results
-                .iter()
-                .map(|&ty| cranelift_to_wasmparser_type(ty))
-                .collect::<Result<_, _>>()?;
-            wasm_types.push((args.into_boxed_slice(), results.into_boxed_slice()));
-        }
-        Ok(Self { wasm_types })
-    }
 }