[OpenMPIRBuilder] Add support for target workshare loops (#73360)

The workshare loop for target region uses the new OpenMP device runtime.
The code generation scheme for the new device runtime is presented
below:

Input code:
```
workshare-loop {
  loop-body
}
```

Output code:
helper function which represents loop body:
```
function-loop-body(counter, loop-body-args) {
  loop-body
}
```
workshare-loop is replaced by the proper device runtime call:
```
call __kmpc_new_worksharing_rtl(function-loop-body, loop-body-args,
                                                     loop-tripcount, ...)
```
This PR uses the new device runtime functions which were added in PR:
https://github.com/llvm/llvm-project/pull/73225