[SIMT][OPT] Add persistent SIMT fragment materialization - #978
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Summary
Add PTOAS support for keeping SIMT fragment values in dedicated register
slots across multiple inline SIMT sections.
The transformation replaces repeated UB-to-register loads with explicit
pto.keep/pto.resumetraffic while preserving the existing VPTO loweringand outlining flow.
Changes
then outline them into
pto.simt_entryhelpers andpto.simt_launchcalls.assignment, vector accesses, control-flow contracts, invalid offsets,
launch-dimension mismatches, and slot-budget violations.