constructor/destructor dispatcher via a function pointer protected from
constant propagation. Also, create (presently unused) .S files that solve
the same problem and in addition allow in-line .init section and .fini
section code. This is too big a mod for a 3.2 pullup, however.
(currently the default), then it compiles on both an ECOFF toolchain
and on an ELF toolchain (but w/o support for dynamic linking or C++
constructors & destructors). If compiled without -DECOFF_COMPAT, it
supports statically- or dynamically-linked ELF binaries (and shared
libraries).