[PATCH] Make .sdata2 writable on ppc vxworks6

[Douglas B Rupp]

Greetings,

In the coming months I will be submitting AdaCore's accumulated binutils 
patches as candidates for inclusion at the FSF.  Most of them will be 
related to our cross ports (e.g. VxWorks).  A few were written by 
engineers who are no longer with AdaCore.  In that case I've done my 
best to research the archeology to find the motivation.

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The attached was originally written by Tristan Gingold.  The motivation 
is to handle PPC TLS on VxWorks in a way compatible with the WRS linker.

It's been extensively tested since 2012 with our own regression testsuite
.
Also, for this submission, with the latest binutils testsuite.

--Douglas Rupp
AdaCore
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