vxworks tls part 2

[Nathan Sidwell]

here's the next bit of vxworks TLS support.  Shared objects need to insert some 
additional dynamic tags to tell the loader about the .tls_data and .tls_vars 
sections.  This patch accomplishes that by two helpers in elf-vxworks.c to 
allocated and then initialize the dynamic tags.  We then call these two helpers 
from the appropriate two places in all the backends supported.

tested on arm, sh, mips, i686, sparc and powerpc vxworks targets.  I also build 
elf targets for the same architectures and observed no regressions.

ok?

nathan
-- 
Nathan Sidwell    ::   http://www.codesourcery.com   ::         CodeSourcery

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