New pqr list test

[Ryanpadrone]

Test Purpose:
These files validate the OpenACC 3.4 clarification about pqr-lists (Section 1.6): a pqr-list must be a comma-separated list with at least one item, and it must not contain a trailing comma.

These tests demonstrate accepted pqr-list forms in both contexts where pqr-lists appear:
•int-expr-list: wait( … )
•var-list: copyin( … ) (and matching present( … ) usage)

Each language file (C, C++, Fortran) contains four runtime tests (T1–T4) that validate correct compilation and execution of legal pqr-lists:
T1 — int-expr-list is non-empty (single-item list)
•Uses wait(1) where the list is 1
•Demonstrates int-expr-list contains at least one item

    T2 — int-expr-list has no trailing comma (multi-item list)

•Uses wait(1,2)
•Demonstrates multi-item int-expr-list with proper commas between items and no trailing comma

    T3 — var-list is non-empty (single-item list)

•Uses a data clause like copyin(a[0:n]) (or Fortran slice)
•Demonstrates var-list contains at least one item

    T4 — var-list has no trailing comma (multi-item list)

•Uses a data clause like copyin(a[0:n], b[0:n]) and/or present(a,b,c)
•Demonstrates multi-item var-list with proper commas between items and no trailing comma

How the test verifies correctness (runtime):
Each test performs a simple vector computation on the device and verifies results on the host using the suite tolerance (PRECISION). Each file’s main returns a bitmask failcode consistent with the testsuite (bit0–bit3 correspond to T1–T4). A return code of 0 indicates all enabled tests passed.

Files
•acc_pqr_list.c
•acc_pqr_list.cpp
•acc_pqr_list.F90

Compiler Versions
NVC: 25.5.0
GCC: 15.2.0
CRAY: 18.0.0