Replace inlined string allocations to loop in 096-array-copy-concurrent

Replacing inlined string allocations with a loop is expected to reduce
the number of GC invocations in case of GC-stress mode. Hopefully, this
will fix the timeout that is being observed.

Bug: 169242013
Test: art/test/testrunner/testrunner.py --host -t 096-array-copy-concurrent
Change-Id: Ib5c4130a5369749f1c28496cc2a1849f776a45be
1 file changed