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Apply the src/dest offsets when blitting bytes.

    When passing values on the stack, we were clobbering args.
    This is bad. This meant subtle corruption.

--- a/6/isel.c

+++ b/6/isel.c

@@ -394,8 +394,8 @@

     tmp = locreg(ModeB);

     i *= Ptrsz; /* we counted in Ptrsz chunks; now we need a byte offset */

     for (; i < sz; i++) {

-        src = locmem(i, sp, NULL, ModeB);

-        dst = locmem(i, dp, NULL, ModeB);

+        src = locmem(i + srcoff, sp, NULL, ModeB);

+        dst = locmem(i + dstoff, dp, NULL, ModeB);

         g(s, Imov, src, tmp, NULL);

         g(s, Imov, tmp, dst, NULL);

     }