Changeset 9709:8a3d4a250bc9
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stats: Add SQLite database as an output format

This patch adds a second output format (in addition to the stats.txt) which
stores the stats in an SQLite database using SQLAlchemy. The information about
each stat is written to the database once to avoid repeated data. Each dump is
given an accociated dump ID which is based on the the number of dumps stored
in the database.

To enable the SQL output, a parameter has been added to gem5. For example,
./build/ARM/gem5.fast --stats-db-file=stats.db ....
will stored the stats in a file called "stats.db". By default SQL stats are
disabled. In order to disable the text-based stats output use --stats-file="".
For backwards compatibility the default behaviour creates stats.txt.

In case SQLAlchemy is unavailable, only stats.txt is generated. If text-based
stats are explicitly disabled, gem5 will fatal.

Generated a number of databases