Fix all clippy warnings (#564)

* Fix all clippy warnings

* Revert usage of inclusive ranges

* Remove redundant function argument

* Revert use of unavailable pointer methods

* Introduce ContiguousCaseRange

lib/filetests/src/test_binemit.rs

@@ -205,7 +205,7 @@ impl SubTest for TestBinEmit {
                 "Inconsistent {} header offset",
                 ebb
             );
-            for (offset, inst, enc_bytes) in func.inst_offsets(&func, ebb, &encinfo) {
+            for (offset, inst, enc_bytes) in func.inst_offsets(ebb, &encinfo) {
                 assert_eq!(sink.offset, offset);
                 sink.text.clear();
                 let enc = func.encodings[inst];