eflowRec: Fix compilation with clang.

Clang doesn't allow constexpr functions in classes with virtual bases. (This appears to be a clang defect.)

This merge request affects 1 package:

• Reconstruction/eflowRec

This merge request affects 2 files:

• Reconstruction/eflowRec/eflowRec/PFCellEOverPTool.h
• Reconstruction/eflowRec/src/PFCellEOverPTool.cxx

Adding @goetz ,@mhodgkin ,@cantel as watchers

added JetEtmiss Reconstruction master review-pending-level-1 labels

CI Result SUCCESS (hash c932114c)

	Athena	AthSimulation	AthGeneration	AnalysisBase	AthAnalysis	DetCommon
externals
cmake
make
required tests
optional tests

Full details available on this CI monitor view. Check the JIRA CI status board for known problems
Athena: number of compilation errors 0, warnings 0
AthSimulation: number of compilation errors 0, warnings 0
AthGeneration: number of compilation errors 0, warnings 0
AnalysisBase: number of compilation errors 0, warnings 0
AthAnalysis: number of compilation errors 0, warnings 0
DetCommon: number of compilation errors 0, warnings 0
For experts only: Jenkins output [CI-MERGE-REQUEST-CC7 52068]

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

CHanges and CI look fine. Approving.

Kira (L1)

merged

mentioned in commit 679d95d7

added sweep:ignore label