tests/tcg: Check that shmat() does not break /proc/self/maps

Add a regression test for a recently fixed issue, where shmat()
desynced the guest and the host view of the address space and caused
open

tests/tcg: Check that shmat() does not break /proc/self/maps

Add a regression test for a recently fixed issue, where shmat()
desynced the guest and the host view of the address space and caused
open("/proc/self/maps") to SEGV.

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Message-Id: <jwyuvao4apydvykmsnvacwshdgy3ixv7qvkh4dbxm3jkwgnttw@k4wpaayou7oq>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

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