bitrotate: Add 64-bit rotates.

[pspp] / ChangeLog

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+2008-09-02  Simon Josefsson  <simon@josefsson.org>
+
+       * lib/bitrotate.h (rotl64, rotr64): Add.  Suggested by Bruce Korb
+       <bruce.korb@gmail.com> with ideas from Ben Pfaff
+       <blp@cs.stanford.edu> and Bruno Haible <bruno@clisp.org>.
+
+       * tests/test-bitrotate.c: Add more test vectors.
+
 2008-09-02  Eric Blake  <ebb9@byu.net>
 
        vasnprintf-posix: handle large precision via %.*d