remove box_syntax uses from cranelift and tools

Author: hellow554

clippy_lints/src/booleans.rs

@@ -116,7 +116,7 @@ impl<'a, 'tcx, 'v> Hir2Qmm<'a, 'tcx, 'v> {
         // prevent folding of `cfg!` macros and the like
         if !e.span.from_expansion() {
             match &e.kind {
-                ExprKind::Unary(UnOp::Not, inner) => return Ok(Bool::Not(box self.run(inner)?)),
+                ExprKind::Unary(UnOp::Not, inner) => return Ok(Bool::Not(Box::new(self.run(inner)?))),
                 ExprKind::Binary(binop, lhs, rhs) => match &binop.node {
                     BinOpKind::Or => {
                         return Ok(Bool::Or(self.extract(BinOpKind::Or, &[lhs, rhs], Vec::new())?));

clippy_lints/src/doc.rs

@@ -578,8 +578,8 @@ fn check_code(cx: &LateContext<'_>, text: &str, edition: Edition, span: Span) {
                 let filename = FileName::anon_source_code(&code);
 
                 let sm = Lrc::new(SourceMap::new(FilePathMapping::empty()));
-                let emitter = EmitterWriter::new(box io::sink(), None, false, false, false, None, false);
-                let handler = Handler::with_emitter(false, None, box emitter);
+                let emitter = EmitterWriter::new(Box::new(io::sink()), None, false, false, false, None, false);
+                let handler = Handler::with_emitter(false, None, Box::new(emitter));
                 let sess = ParseSess::with_span_handler(handler, sm);
 
                 let mut parser = match maybe_new_parser_from_source_str(&sess, filename, code) {