Blackfin: eh crash fix

[Bernd Schmidt]

I've committed the following patch, which fixes a problem with C++
exception handling in Blackfin FD-PIC binaries.  The problem was that
.rofixup contained an invalid entry, generated by the linker when
encountering a reloc against a deleted part of .eh_frame.  We already
have code in place to handle this for other relocs; the patch below
makes sure we don't create garbage in .rofixup for deleted byte4 relocs.
 We use a placeholder value of -1 to communicate to the startup code
that a rofixup was deleted - unfortunately I can't see an easy way to
just omit it and shrink the section instead.

There's a corresponding patch in the uClibc startup code to ignore these
dummy -1 values; that one has been in the uClibc svn repository for a while.


Bernd
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