[flang] [llvm] [mlir] [llvm][mlir][OpenMP] Support translation for linear clause in omp.wsloop (PR #139386)

[via llvm-commits]

NimishMishra wrote:

The following test case from OpenMP examples document compiles successfully with a combination of PR https://github.com/llvm/llvm-project/pull/139385 and this PR:

```
program linear_loop
 use omp_lib
 implicit none
 integer, parameter :: N = 100
 real :: a(N), b(N/2)
 integer :: i, j

 do i = 1, N
 a(i) = i
 end do

 j = 0
 !$omp parallel
 !$omp do linear(j:1)
 do i = 1, N, 2
 j = j + 1
 b(j) = a(i) * 2.0
 end do
 !$omp end parallel

 print *, j, b(1), b(j)
 ! print out: 50 2.0 198.0

 end program
```


Flang output: `50 2. 198.` as expected.

https://github.com/llvm/llvm-project/pull/139386