bug#30855: 25.3; temacs fails with bus error during garbage collection

[Paul Eggert]

Even with the fix the code assumes that Lisp_Object is aligned at least 
as strictly as void *; this should be verified. Plus, if the alignments 
are the same Emacs can avoid a runtime check each time through the loop, 
which should help branch prediction. I installed the attached into 
master; if it fixes Ulrich's problem I think this should be backported 
to emacs-26. Thanks to Ulrich, Eli, and Andreas for reporting this and 
suggesting the fix.

0001-Port-to-32-bit-sparc64.patch
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