[llvm-branch-commits] [OpenMP] Runtime support for graph_id and graph_reset clauses (for taskgraph) (PR #195074)

[Julian Brown via llvm-branch-commits]

https://github.com/jtb20 created https://github.com/llvm/llvm-project/pull/195074

This patch contains runtime support for the graph_id and graph_reset
clauses -- in particular, adding support for freeing recorded taskgraphs
on reset, and initial/planned support for keeping previous recorded
taskgraphs live until their execution count reaches zero, when concurrent
playback is implemented.

A new structure is introduced here, kmp_taskgraph_header_t: this is
now what the per-syntactic taskgraph handle passed in from the user
program points to during recording.  These structures are never freed
once allocated.

FD: this patch is mostly handwritten, but AI helped a bit with debugging,
so adding the tag.

Assisted-By: Codex/gpt-5.3