StoreGate: Fix cppcheck warnings.

• Move DataHandle comparison functions inline.
• Don't pass large objects by value.

This merge request affects 1 package:

• Control/StoreGate

Adding @ssnyder as watcher

added Core master review-pending-level-1 labels

CI Result SUCCESS (hash b8699a04)

	Athena	AthSimulation	AnalysisBase	AthGeneration
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
AnalysisBase: number of compilation errors 0, warnings 0
AthGeneration: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 15824]

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

merged

mentioned in commit f7be63aa

added sweep:ignore label