_LP64 and _ILP32

[Ben Laurie]

It turns out that both clang and gcc define _LP64 when used native on amd64.

Neither defines _ILP32 on i386 (native or cross-compiled).

dt_popc() in cddl/contrib/opensolaris/lib/libdtrace/common/dt_subr.c
needs on or the other. clang notices because when _ILP32 is missing
there's no return.

So ... thoughts?--

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