Fix OpenMP 6.0 taskgraph/target clause parsing and graph_reset payload

[ouankou]

Summary

This PR rebases the OpenMP 6.0 fixes onto the latest origin/main and addresses parser/IR root causes uncovered by OpenMP_VV 6.0 coverage.

Root Cause

OpenMP 6.0 syntax was partially parsed but not fully modeled in clause construction paths:

• taskgraph nogroup was not accepted in taskgraph_clause.
• graph_reset(expr) was not accepted (only bare graph_reset).
• target ... shared(...) used in taskgraph-target cases was rejected.
• Several OpenMP 6.0 clause kinds were not handled in OpenMPDirective::addOpenMPClause, causing null clause objects and parser instability.
• graph_reset stringification dropped optional expression payload.

Changes

src/ompparser.yy

• Allow optional argument form for graph_reset:
  • graph_reset
  • graph_reset(<expression>)
• Add nogroup_clause to taskgraph_clause.
• Add shared_clause to target_clause.

src/OpenMPIR.cpp

• Add missing clause-kind handling in OpenMPDirective::addOpenMPClause for:
  • OMPC_graph_id
  • OMPC_graph_reset
  • OMPC_replayable
  • OMPC_memscope
• Update OpenMPGraphResetClause::toString() to preserve optional expression payload:
  • graph_reset or graph_reset(expr) as appropriate.

Validation

Built and tested after rebasing onto latest origin/main:

cmake --build build -j$(nproc)
ctest --test-dir build --output-on-failure -j$(nproc)

Result: 1526/1526 tests passed.

Notes

This keeps behavior in the parser/IR layer (no output masking/workarounds) and aligns OpenMP 6.0 taskgraph/target clause acceptance with OpenMP_VV usage.

[ouankou]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Breezy!

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