Fix all dead-code warnings in cranelift-codegen

cranelift/codegen/src/isa/unwind.rs

@@ -24,77 +24,6 @@ pub enum UnwindInfo {
     SystemV(systemv::UnwindInfo),
 }
 
-/// Intermediate representation for the unwind information
-/// generated by a backend.
-pub mod input {
-    use crate::binemit::CodeOffset;
-    use alloc::vec::Vec;
-    #[cfg(feature = "enable-serde")]
-    use serde::{Deserialize, Serialize};
-
-    /// Elementary operation in the unwind operations.
-    #[derive(Clone, Debug, PartialEq, Eq)]
-    #[cfg_attr(feature = "enable-serde", derive(Serialize, Deserialize))]
-    pub enum UnwindCode<Reg> {
-        /// Defines that a register is saved at the specified offset.
-        SaveRegister {
-            /// The saved register.
-            reg: Reg,
-            /// The specified offset relative to the stack pointer.
-            stack_offset: u32,
-        },
-        /// Defines that a register is as defined before call.
-        RestoreRegister {
-            /// The restored register.
-            reg: Reg,
-        },
-        /// The stack pointer was adjusted to allocate the stack.
-        StackAlloc {
-            /// Size to allocate.
-            size: u32,
-        },
-        /// The stack pointer was adjusted to free the stack.
-        StackDealloc {
-            /// Size to deallocate.
-            size: u32,
-        },
-        /// The alternative register was assigned as frame pointer base.
-        SetFramePointer {
-            /// The specified register.
-            reg: Reg,
-        },
-        /// Restores a frame pointer base to default register.
-        RestoreFramePointer,
-        /// Saves the state.
-        RememberState,
-        /// Restores the state.
-        RestoreState,
-        /// On aarch64 ARMv8.3+ devices, enables or disables pointer authentication.
-        Aarch64SetPointerAuth {
-            /// Whether return addresses (hold in LR) contain a pointer-authentication code.
-            return_addresses: bool,
-        },
-    }
-
-    /// Unwind information as generated by a backend.
-    #[derive(Clone, Debug, PartialEq, Eq)]
-    #[cfg_attr(feature = "enable-serde", derive(Serialize, Deserialize))]
-    pub struct UnwindInfo<Reg> {
-        /// Size of the prologue.
-        pub prologue_size: CodeOffset,
-        /// Unwind codes for prologue.
-        pub prologue_unwind_codes: Vec<(CodeOffset, UnwindCode<Reg>)>,
-        /// Unwind codes for epilogues.
-        pub epilogues_unwind_codes: Vec<Vec<(CodeOffset, UnwindCode<Reg>)>>,
-        /// Entire function size.
-        pub function_size: CodeOffset,
-        /// Platform word size in bytes.
-        pub word_size: u8,
-        /// Initial stack pointer offset.
-        pub initial_sp_offset: u8,
-    }
-}
-
 /// Unwind pseudoinstruction used in VCode backends: represents that
 /// at the present location, an action has just been taken.
 ///