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Add an additional test of TLS variables, with different alignment,
accessed from different modules. The idea of the alignment test is
similar to tst-tlsalign and the same code is shared for setting up
test variables, but unlike the tst-tlsalign code, there are multiple
threads and variables are accessed from multiple objects to verify
that they get a consistent notion of the address of an object within a
thread. Threads are repeatedly created and shut down to verify proper
initialization in each new thread. The test is also repeated with TLS
descriptors when supported. (However, only initial-exec TLS is
covered in this test.)
Tested for x86_64.
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