[mn10300, installed] improve PICness

[Alexandre Oliva]

This patch fixes a bug in the mn10300 back-end that permitted non-PIC
addressing modes such as (symbol+offset,register) to be emitted when
compiling with -fPIC.  I'm checking it in.  Tested on
i686-pc-linux-gnu-x-mn10300-elf.

This hadn't been noticed before because the linker fails to mark
non-PIC shared libraries with TEXTREL.  I'll fix this problem in
the linker as soon as I have a chance.

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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}