KLGaussianMixtureReduction rm AVX2 implementation keep just the SSE ones

KLGaussianMixtureReduction rm AVX2 implementation keep just the SSE ones at least for now.

changed the description

This merge request affects 1 package:

• Tracking/TrkFitter/TrkGaussianSumFilterUtils

This merge request affects 2 files:

• Tracking/TrkFitter/TrkGaussianSumFilterUtils/TrkGaussianSumFilterUtils/KLGaussianMixtureReduction.h
• Tracking/TrkFitter/TrkGaussianSumFilterUtils/src/KLGaussianMixtureReduction.cxx

Adding @amorley as watcher

added Egamma Tracking master review-pending-level-1 labels

CI Result SUCCESS (hash f7302172)

	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 44562]

Looking good from my perspective, moving on to L2.

-- L1

added review-pending-level-2 label and removed review-pending-level-1 label

Fine with me as well, approving.

Pavol [as L2 MR shifter]

added review-approved label and removed review-pending-level-2 label

merged

mentioned in commit e8439f33

added sweep:ignore label