Add execution-time loops

[jafingerhut]

Personnel

• Owner: @ChrisDodd
• Supporters: @jafingerhut

Design

• Document:

Implementation

• p4-spec: For-loop additions #1315
• p4c: Fix loop unrolling bugs related to issue4739 p4c#4783 and several other PRs to fix small issues

Process

• LDWG discussed: Discussed basic idea and corner cases at 3 or 4 monthly LDWG meetings in 2024. Have not yet discussed the proposed spec PR.
• LDWG approved:
• Merged into p4-spec:
• Merged into p4c:

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Note: This issue is only tracking the progress of adding "execution loops" or "run-time loops" to P4.

Issue #1326 tracks compile-time / macro loops.