mem-ruby: Enable set size increase

Add NUMBER_BITS_PER_SET environment variable to control
the size of the bitmask in Set.hh (default=64).
Necessary for configs which require >64 instances of a given
machine type. This can be set in the build_opts file, e.g.
by adding the following line:

Change-Id: I314a3cadca8ce975fcf4a60d9022494751688e88
Reviewed-by: Tiago Mück <>
Reviewed-by: Jason Lowe-Power <>
Reviewed-by: Nikos Nikoleris <>
Maintainer: Jason Lowe-Power <>
Tested-by: kokoro <>
4 files changed