[llvm] [offload][omp] Move reading _kernel_environment to libomptarget (PR #222606)

[Robert Imschweiler via llvm-commits]

================
@@ -459,8 +465,72 @@ static int loadImagesOntoDevice(DeviceTy &Device) {
               REPORT() << "Failed to write symbol for USM " << Entry.SymbolName;
         } else if (Entry.Address) {
           if (Device.RTL->get_function(Binary, Entry.SymbolName,
-                                       &DeviceEntry.Address) != OFFLOAD_SUCCESS)
+                                       &DeviceEntry.Address) !=
+              OFFLOAD_SUCCESS) {
             REPORT() << "Failed to load kernel " << Entry.SymbolName;
+            continue;
----------------
ro-i wrote:

but isn't that used here?

```c++
      __tgt_target_table DeviceTable{&DeviceEntries[0],
                                     &DeviceEntries[0] + DeviceEntries.size()};
      TransTable->DeviceTables[DeviceId] = DeviceTable;
      __tgt_target_table *TargetTable = TransTable->TargetsTable[DeviceId] =
          &TransTable->DeviceTables[DeviceId];
```

https://github.com/llvm/llvm-project/pull/222606