[Bug fortran/106268] New: [suboptimal] Remove unnecessary loops releated to fortran compare to ifort

[zhongyunde at huawei dot com via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106268

            Bug ID: 106268
           Summary: [suboptimal] Remove unnecessary loops releated to
                    fortran compare to ifort
           Product: gcc
           Version: 13.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: fortran
          Assignee: unassigned at gcc dot gnu.org
          Reporter: zhongyunde at huawei dot com
  Target Milestone: ---

For the kernel inner loop body, gcc generate an loop, while icc doesn't, see
detail in https://godbolt.org/z/G77nKnf8W.
```
    DO i = 1, 10000
      do l = 1, ADM_lall
        rhogw_vm(:,ADM_kmin  ,l) = 0.D0
        rhogw_vm(:,ADM_kmax+1,l) = 0.D0
      enddo
    enddo
```