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perf: disable ASLR for perf testing

Address Space Layout Randomization may lead to different addresses
returned by the allocator from run to run. It means that LuaJIT may have
different traces compiled for different runs since the hotcount function
depends on bytecode addresses. It leads to different amounts of GC
steps/cycles and different VM states after Tarantool's startup, which
may affect its performance for particular benchmarks. To avoid this type
of instability, just disable ASLR for performance testing.

NO_DOC=perf
NO_TEST=perf
NO_CHANGELOG=perf

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