* libdruntime/Makefile.am: Add emutls and gthread files.
* libdruntime/Makefile.in: Regenerate.
* libdruntime/gcc/emutls.d: New file. Implement GC-compatible emutls.
* libdruntime/gcc/gthread.d: New file.
* libdruntime/gcc/sections/elf_shared.d: Integrate emutls support.
* testsuite/libphobos.allocations/tls_gc_integration.d: New test for
TLS.

From-SVN: r270568