0.8.19.16:

0.8.19.16:
	Various x86-64 improvements.
        * Fix some SB-ALIEN:INT / SB-ALIEN:INTEGER confusion in tests.
          (Patch by Vincent Arkesteijn on sbcl-devel, "Re: x86-64 (aka
          AMD64, EMT-64) support" on 2005-02-05).
        * Align the stack to 16-byte boundaries for c-calls, as required
          by the ABI. (Patch by Cheuksan Edward Wang).
        * Omit unneccessary rex-prefix on indirect JMP. (Patch by Cheuksan
          Edward Wang).
        * Disassembler improvements. (Patch by Cheuksan Edward Wang).