viable/strict/1792096016: [dynamo] Lazily load current stream argument (#199169)
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What happened
Save ~3 µs on warm-cache kernel loads that don't utilize the current stream by not loading it in cases where it's unused. Code primarily authored via Claude Opus 5.5. Pull Request resolved: #199169 Approved by: https://github.com/guilhermeleobas , https://github.com/eellison ghstack dependencies: #198673 , #199407 , #199201 , #199186 , #199187 , #199408
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