Sweeping !23901 from 21.2 to 21.0. VKalVrt: Build memory corruption/Segfault fix

VKalVrt: Build memory corruption/Segfault fix

See merge request !23901 (merged)

added sweep:from 21.2 label

Adding original author @abarton as watcher.

restored source branch cherry-pick-f36daa375d-21.0

This merge request affects 1 package:

• Tracking/TrkVertexFitter/TrkVKalVrtFitter

added 21.0 Tracking review-pending-level-1 labels

CI Result SUCCESS

	Athena	AthDataQuality	AthSimulation
externals
cmake
make
required tests
optional tests

Full details available at NICOS MR-23952-2019-06-05-07-50
Athena: number of compilation errors 0, warnings 162
AthDataQuality: number of compilation errors 0, warnings 1
AthSimulation: number of compilation errors 0, warnings 5
For experts only: Jenkins output [CI-MERGE-REQUEST 39437]

There are quite some compilation warnings but they are unrelated to this change, so approving. Catrin (L1 shifter)

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

merged

mentioned in commit e48bd3f2

added sweep:done label

added sweep:failed label

Sweep summary
failed:

• master

mentioned in merge request !24191 (merged)

mentioned in commit 71376efd