CxxUtils: Null bitset fix.

Fix implementation size calculation for a zero-length ConcurrentBitset: we always need to include at least one block. Fixes memory corruption observed in the unit test.

This merge request affects 1 package:

• Control/CxxUtils

Adding @ssnyder ,@rbianchi as watchers

added Core master review-pending-level-1 labels

CI Result SUCCESS (hash 606ffb30)

	Athena	AthSimulation
externals
cmake
make
required tests
optional tests

Full details available on this CI monitor view
Athena: number of compilation errors 0, warnings 0
AthSimulation: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 7799]

The changes look ok. Adding review-approved label.

L1 shifter

added review-approved label and removed review-pending-level-1 label

merged

mentioned in commit 202619a8

added sweep:ignore label