OpenMP test failure in GitHub workflow

[bryanpkc]

This CI job had failed, even though there had been no code change in either LLVM or Classic Flang. The commands and errors were as follows:

clang -c -c -I/home/runner/work/flang/flang/test/mp_correct/lit/../src  -fopenmp  /home/runner/work/flang/flang/test/mp_correct/lit/../src/check.c -o check.o
------------ building test pv01.o
flang -c -I/home/runner/work/flang/flang/test/mp_correct/lit/../src  -fopenmp    /home/runner/work/flang/flang/test/mp_correct/lit/../src/pv01.f90
flang   -fopenmp pv01.o check.o  -o a.exe
------------ executing test pv01
OMP_NUM_THREADS=4 ./a.exe 
Warning: ieee_inexact is signaling
FORTRAN STOP
 Error occured while allocating when parallel