[STF] Fix an iterator type error with an unordered_multimap

[caugonnet]

Fix a problematic use of the internal iterator type of an unordered_multimap

Description

closes

Checklist

• New or existing tests cover these changes.
• The documentation is up to date with these changes.

[copy-pr-bot]

This pull request requires additional validation before any workflows can run on NVIDIA's runners.

Pull request vetters can view their responsibilities here.

Contributors can view more details about this message here.

[caugonnet]

/ok to test

[caugonnet]

/ok to test

[github-actions]

🟩 CI finished in 1h 45m: Pass: 100%/24 | Total: 6h 09m | Avg: 15m 23s | Max: 29m 38s | Hits: 65%/13500

• 🟩 cudax: Pass: 100%/24 | Total: 6h 09m | Avg: 15m 23s | Max: 29m 38s | Hits: 65%/13500

  🟩 cpu
    🟩 amd64              Pass: 100%/20  | Total:  5h 16m | Avg: 15m 49s | Max: 29m 38s | Hits:  66%/11148 
    🟩 arm64              Pass: 100%/4   | Total: 52m 37s | Avg: 13m 09s | Max: 14m 26s | Hits:  58%/2352  
  🟩 ctk
    🟩 12.0               Pass: 100%/1   | Total: 11m 43s | Avg: 11m 43s | Max: 11m 43s | Hits:  95%/282   
    🟩 12.8               Pass: 100%/23  | Total:  5h 57m | Avg: 15m 32s | Max: 29m 38s | Hits:  64%/13218 
  🟩 cudacxx
    🟩 nvcc12.0           Pass: 100%/1   | Total: 11m 43s | Avg: 11m 43s | Max: 11m 43s | Hits:  95%/282   
    🟩 nvcc12.8           Pass: 100%/23  | Total:  5h 57m | Avg: 15m 32s | Max: 29m 38s | Hits:  64%/13218 
  🟩 cudacxx_family
    🟩 nvcc               Pass: 100%/24  | Total:  6h 09m | Avg: 15m 23s | Max: 29m 38s | Hits:  65%/13500 
  🟩 cxx
    🟩 Clang14            Pass: 100%/1   | Total: 14m 26s | Avg: 14m 26s | Max: 14m 26s | Hits:  58%/590   
    🟩 Clang15            Pass: 100%/1   | Total: 15m 24s | Avg: 15m 24s | Max: 15m 24s | Hits:  58%/588   
    🟩 Clang16            Pass: 100%/1   | Total: 17m 07s | Avg: 17m 07s | Max: 17m 07s | Hits:  58%/588   
    🟩 Clang17            Pass: 100%/1   | Total: 15m 26s | Avg: 15m 26s | Max: 15m 26s | Hits:  58%/588   
    🟩 Clang18            Pass: 100%/1   | Total: 15m 15s | Avg: 15m 15s | Max: 15m 15s | Hits:  58%/588   
    🟩 Clang19            Pass: 100%/4   | Total: 53m 23s | Avg: 13m 20s | Max: 15m 21s | Hits:  69%/2352  
    🟩 GCC10              Pass: 100%/1   | Total: 15m 59s | Avg: 15m 59s | Max: 15m 59s | Hits:  58%/590   
    🟩 GCC11              Pass: 100%/1   | Total: 15m 55s | Avg: 15m 55s | Max: 15m 55s | Hits:  58%/588   
    🟩 GCC12              Pass: 100%/1   | Total: 16m 14s | Avg: 16m 14s | Max: 16m 14s | Hits:  58%/588   
    🟩 GCC13              Pass: 100%/8   | Total:  1h 47m | Avg: 13m 24s | Max: 16m 59s | Hits:  68%/4704  
    🟩 MSVC14.39          Pass: 100%/1   | Total: 11m 43s | Avg: 11m 43s | Max: 11m 43s | Hits:  95%/282   
    🟩 MSVC14.42          Pass: 100%/1   | Total: 13m 22s | Avg: 13m 22s | Max: 13m 22s | Hits:  95%/282   
    🟩 NVHPC25.3          Pass: 100%/2   | Total: 57m 45s | Avg: 28m 52s | Max: 29m 38s | Hits:  55%/1172  
  🟩 cxx_family
    🟩 Clang              Pass: 100%/9   | Total:  2h 11m | Avg: 14m 33s | Max: 17m 07s | Hits:  63%/5294  
    🟩 GCC                Pass: 100%/11  | Total:  2h 35m | Avg: 14m 07s | Max: 16m 59s | Hits:  65%/6470  
    🟩 MSVC               Pass: 100%/2   | Total: 25m 05s | Avg: 12m 32s | Max: 13m 22s | Hits:  95%/564   
    🟩 NVHPC              Pass: 100%/2   | Total: 57m 45s | Avg: 28m 52s | Max: 29m 38s | Hits:  55%/1172  
  🟩 gpu
    🟩 h100               Pass: 100%/2   | Total: 26m 55s | Avg: 13m 27s | Max: 15m 14s | Hits:  78%/1176  
    🟩 rtx2080            Pass: 100%/22  | Total:  5h 42m | Avg: 15m 33s | Max: 29m 38s | Hits:  63%/12324 
  🟩 jobs
    🟩 Build              Pass: 100%/21  | Total:  5h 28m | Avg: 15m 38s | Max: 29m 38s | Hits:  59%/11736 
    🟩 Test               Pass: 100%/3   | Total: 40m 57s | Avg: 13m 39s | Max: 15m 14s | Hits:  99%/1764  
  🟩 sm
    🟩 90                 Pass: 100%/3   | Total: 38m 09s | Avg: 12m 43s | Max: 15m 14s | Hits:  70%/1764  
    🟩 90a                Pass: 100%/1   | Total: 11m 51s | Avg: 11m 51s | Max: 11m 51s | Hits:  58%/588   
  🟩 std
    🟩 17                 Pass: 100%/4   | Total:  1h 04m | Avg: 16m 08s | Max: 28m 07s | Hits:  56%/2350  
    🟩 20                 Pass: 100%/20  | Total:  5h 04m | Avg: 15m 14s | Max: 29m 38s | Hits:  66%/11150 
  

👃 Inspect Changes

Modifications in project?

	Project
	CCCL Infrastructure
	libcu++
	CUB
	Thrust
+/-	CUDA Experimental
	stdpar
	python
	CCCL C Parallel Library
	Catch2Helper

Modifications in project or dependencies?

	Project
	CCCL Infrastructure
	libcu++
	CUB
	Thrust
+/-	CUDA Experimental
	stdpar
	python
	CCCL C Parallel Library
	Catch2Helper

🏃‍ Runner counts (total jobs: 24)

#	Runner
15	linux-amd64-cpu16
4	linux-arm64-cpu16
2	windows-amd64-cpu16
2	linux-amd64-gpu-rtx2080-latest-1
1	linux-amd64-gpu-h100-latest-1