Don't return CodeInfo from Context::compile_and_emit

It is already available through ctx.mach_compile_result and rarely
needed.

cranelift/object/src/backend.rs

@@ -5,7 +5,7 @@ use cranelift_codegen::entity::SecondaryMap;
 use cranelift_codegen::isa::TargetIsa;
 use cranelift_codegen::{self, ir};
 use cranelift_codegen::{
-    binemit::{Addend, CodeInfo, CodeOffset, Reloc, RelocSink, StackMapSink, TrapSink},
+    binemit::{Addend, CodeOffset, Reloc, RelocSink, StackMapSink, TrapSink},
     CodegenError,
 };
 use cranelift_module::{
@@ -311,21 +311,16 @@ impl Module for ObjectModule {
         stack_map_sink: &mut dyn StackMapSink,
     ) -> ModuleResult<ModuleCompiledFunction> {
         info!("defining function {}: {}", func_id, ctx.func.display());
-        let CodeInfo {
-            total_size: code_size,
-            ..
-        } = ctx.compile(self.isa())?;
-        let mut code: Vec<u8> = vec![0; code_size as usize];
+        let mut code: Vec<u8> = Vec::new();
         let mut reloc_sink = ObjectRelocSink::default();
 
-        unsafe {
-            ctx.emit_to_memory(
-                code.as_mut_ptr(),
-                &mut reloc_sink,
-                trap_sink,
-                stack_map_sink,
-            )
-        };
+        ctx.compile_and_emit(
+            self.isa(),
+            &mut code,
+            &mut reloc_sink,
+            trap_sink,
+            stack_map_sink,
+        )?;
 
         self.define_function_bytes(func_id, &code, &reloc_sink.relocs)
     }