Fix radix sort test (12.0.x)

[fwyzard]

PR description:

Fix the compilation errors in HeterogeneousCore/CUDAUtilities/test/radixSort_t.cu:

• take into account the actual size of the type being sorted, instead of always assuming a 64-bit type;
• use an union instead of a cast to keep the compiler happy about the aliasing rules.

PR validation:

gpuRadixSort_t compiles and runs fine.

if this PR is a backport please specify the original PR and why you need to backport that PR:

Backport of #34929.

[fwyzard]

type bugfix

[fwyzard]

backport #34929

[fwyzard]

please test

[cmsbuild]

A new Pull Request was created by @fwyzard (Andrea Bocci) for CMSSW_12_0_X.

It involves the following packages:

• HeterogeneousCore/CUDAUtilities (heterogeneous)

@makortel, @fwyzard can you please review it and eventually sign? Thanks.
@makortel, @rovere this is something you requested to watch as well.
@perrotta, @dpiparo, @qliphy you are the release manager for this.

cms-bot commands are listed here

• Backported from Fix radix sort test #34929

[fwyzard]

+heterogeneous

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_12_0_X IBs after it passes the integration tests and once validation in the development release cycle CMSSW_12_1_X is complete. 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)

[cmsbuild]

+1

Summary: https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-0cfe6b/17850/summary.html
COMMIT: bd35faa
CMSSW: CMSSW_12_0_X_2021-08-17-2300/slc7_amd64_gcc900
User test area: For local testing, you can use /cvmfs/cms-ci.cern.ch/week0/cms-sw/cmssw/34930/17850/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: 6 differences found in the comparisons
• DQMHistoTests: Total files compared: 39
• DQMHistoTests: Total histograms compared: 2998564
• DQMHistoTests: Total failures: 13
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 2998529
• DQMHistoTests: Total skipped: 22
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 0.0 KiB( 38 files compared)
• Checked 165 log files, 37 edm output root files, 39 DQM output files
• TriggerResults: no differences found

[qliphy]

+1