[ACTIVITY] Weekly report for week 49

=== Work done during last week ===

* DSGHACK-25 (Support arithmetic on FileCheck regex variable): + simplifies how numeric expression are matched and checked, easier to explain too + start code cleanup and increasing testing, ETA: end of next week * Line management.

=== Plan for week 50 ===

* DSGHACK-25 (Support arithmetic on FileCheck regex variable): + extend testcase coverage (add tests for latest syntax change and add more negative testing) + finish cleaning up the code + improve documentation * Try to reproduce perf issue mentioned in week #30's weekly report on latest perf * Line management