fix some oss-fuzz (#1224)

* fix oss-fuzz 18138.

* fix oss-fuzz 20079.

* fix oss-fuzz 20209.

* fix oss-fuzz 20210.

* fix oss-fuzz 20262.

* rollback.

* rollback.

* fix oss-fuzz 20079.

* fix oss-fuzz 20179.

* fix oss-fuzz 20195.

* fix oss-fuzz 20206.

* fix oss-fuzz 20207.

* fix oss-fuzz 20265.

* fix oss-fuzz 20285.

* fix oss-fuzz 20868.

* fix oss-fuzz 20908.

* fix oss-fuzz 20909.

* fix oss-fuzz 20914.

* fix oss-fuzz 20922.

* fix oss-fuzz 20928.

* remove warnigs.

* fix oss-fuzz 20961.

* fix oss-fuzz 21005.

* remove clang warnings.

* fix oss-fuzz 21043.

* fix oss-fuzz 21047.

* fix oss-fuzz 21050.

* fix oss-fuzz 21219.

qemu/target-m68k/translate.c

@@ -1170,7 +1170,7 @@ DISAS_INSN(bitop_im)
         bitnum &= 7;
     else
         bitnum &= 31;
-    mask = 1 << bitnum;
+    mask = 1U << bitnum;
 
     tmp = tcg_temp_new(tcg_ctx);
     assert (CCF_Z == (1 << 2));