Starting with https://github.com/gem5/gem5/pull/1453 , some Ruby
structures require a block size be set
and other require a pointer to the Ruby system. This fixes some cases
which were not covered by the per-checkin tests but seen in daily+
tests. In particular:
- WriteMasks and PerfectCacheMemory must explicitly set a block size.
- NetDest and RubyProxyPort require RubySystem pointer.
- Classes inheriting Message now have a setRubySystem collecting all
objects that need a RubySystem pointer and this should be called in
the constructor of the Message.
This commit makes sure all of these happen. This should fix daily
arm_boot_tests and daily learning_gem5 tests.
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