fix vxworks TLS sections

[Nathan Sidwell]

I've committed this patch to fix a problem with vxworks TLS sections.  Vxworks 
uses a scheme similar to the emulated TLS scheme GCC uses where proper TLS is 
unavailable.  I'd originally placed the initialization values in the read-only 
text segment, but this is incorrect because an initialization value may be the 
address of a global variable, and hence have a relocation.  If that happens, the 
text segment is no longer read-only and in some alignment-specific cases, you 
can end up with only one loadable segment, rather than 2.  The vxworks RTP 
loader dies in that case -- I guess I just got lucky with the original set of 
testcases I was using.

Anyway, this places it always in the data segment.

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

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