[PATCH] Harden tls_dtor_list with pointer mangling [BZ #19018]

[Florian Weimer]

This patch mangles the destructor function pointer in tls_dtor_list with
pointer mangling, making it more difficult to construct a function
pointer which does not lead to a crash.

Tested with the new thread_local test on x86_64 (with thread_local
support in GCC).

Florian
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