avoid NULL pointer ambiguity in mn10300 sim

[Alexandre Oliva]

GDB gets thoroughly confused if the address of the start symbol looks
like a NULL pointer.  ISO C requires no other pointer to compare equal
to the NULL pointer as well, so make sure we don't have any objects at
address zero.

Ok to install?

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-- 
Alexandre Oliva             http://www.ic.unicamp.br/~oliva/
Red Hat Compiler Engineer   aoliva@{redhat.com, gcc.gnu.org}
Free Software Evangelist  oliva@{lsd.ic.unicamp.br, gnu.org}