Eigen: Convert diag pragmas to nv_diag

[iarspider]

Copied from https://gitlab.com/libeigen/eigen/-/merge_requests/716 . Fixes cms-sw/cmssw#37280 (hopefully).

[iarspider]

please test

[cmsbuild]

A new Pull Request was created by @iarspider for branch IB/CMSSW_12_4_X/master.

@smuzaffar, @aandvalenzuela, @iarspider can you please review it and eventually sign? Thanks.
@perrotta, @dpiparo, @qliphy you are the release manager for this.
cms-bot commands are listed here

[cmsbuild]

+1

Summary: https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-03fa9a/23726/summary.html
COMMIT: 813f372
CMSSW: CMSSW_12_4_X_2022-04-07-1100/slc7_amd64_gcc10
User test area: For local testing, you can use /cvmfs/cms-ci.cern.ch/week1/cms-sw/cmsdist/7768/23726/install.sh to create a dev area with all the needed externals and cmssw changes.

Comparison Summary

Summary:

• No significant changes to the logs found
• Reco comparison results: 4 differences found in the comparisons
• DQMHistoTests: Total files compared: 48
• DQMHistoTests: Total histograms compared: 3593039
• DQMHistoTests: Total failures: 7
• DQMHistoTests: Total nulls: 1
• DQMHistoTests: Total successes: 3593009
• DQMHistoTests: Total skipped: 22
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: -0.004 KiB( 47 files compared)
• DQMHistoSizes: changed ( 312.0 ): -0.004 KiB MessageLogger/Warnings
• Checked 200 log files, 45 edm output root files, 48 DQM output files
• TriggerResults: no differences found

[smuzaffar]

+externals
yes has fixed ( see build logs https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-03fa9a/23726/build-logs/HeterogeneousCore/CUDAUtilities/log.html ) the eigen warnings reported cms-sw/cmssw#37280

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next IB/CMSSW_12_4_X/master IBs (tests are also fine). This pull request will now be reviewed by the release team before it's merged. @perrotta, @dpiparo, @qliphy (and backports should be raised in the release meeting by the corresponding L2)