craycc: sections in a target parallel region is accepted without a message and gives a wrong result

// # Draft finding: omp52-c-w-sections on cce19
//
// - compiler: cce19
// - toolchain: cce19; arch: gfx942; machine: tuolumne; memory mode: unified; opt: -O2
// - program: catalog omp52-c-w-sections (c, version 52, sha256 27f3fa01bb99e123)
// - expected: check=pass (trusted; elision + model)
// - actual: wrong_answer check=fail (check_fail: ran_on_host=0 check=fail)
// - verdict: compiler_bug by rule R20-runtime-bug: a legal program fails at run time, deterministically, against an expected value from two or more independent sources with an executed witness, and another toolchain, mode, arch or the elision gives the expected value
// - reason: expected trusted check=pass (elision + model): stored main verdict: elision + model agree; witnesses: afar/gfx942/unified, elision
// - citations: RUL-DERIVED-NEEDS-EXECUTION (rulings.md); RUL-WITNESS-PER-MODE (rulings.md); RUL-SAME-COMPILER-RUNS (rulings.md); RUL-PRESENCE-WITNESS (rulings.md); RUL-METAMORPHIC-OTHER-FAMILY (rulings.md)
// - legality: legal: offload.engine.prerun.check accepts it (rerun: offload.engine.rules with the
//   race rule and the restriction checks, and the AFAR clang front end, not under test here); no
//   compiler under test, gfortran or gcc is a legality witness
// - witnesses: afar/gfx942/unified, elision
// - withdrawn: none
//
// Generated by compliance.widen (OpenMP 5.2, C11; catalog widening). Do not edit.
// id: omp52-c-w-sections
// primary atom: omp.directive.sections
// atoms: omp.directive.sections
// legal: yes
// observable: yes
// ran_on_host: inside the target region of interest
// evidence: construct
// needs: none
// std: c11
// feature: a sections construct with two sections in a target parallel region
// spec: OpenMP 5.2 §11.3, p.243 (sections construct)
#include <stdio.h>
#include <stdbool.h>
#include <omp.h>

enum { n = 64 };

int main(void) {
  int a[n], b[n], ref[n];
  int host_flag = 1;
  for (int i = 0; i < n; i++) {
    a[i] = i + 1;
    b[i] = 0;
    ref[i] = 2 * (i + 1) + 1;
  }
  #pragma omp target parallel map(to: a) map(tofrom: b, host_flag)
  {
    #pragma omp sections
    {
      #pragma omp section
      {
        for (int i = 0; i < n / 2; i++) b[i] = 2 * a[i] + 1;
        host_flag = omp_is_initial_device();
      }
      #pragma omp section
      {
        for (int i = n / 2; i < n; i++) b[i] = a[i] + a[i] + 1;
      }
    }
  }
  bool ok = true;
  for (int i = 0; i < n; i++)
    ok = ok && (b[i] == ref[i]);
  printf("RESULT ran_on_host=%d check=%s\n", host_flag, ok ? "pass" : "fail");
  return 0;
}