[llvm] [OFFLOAD] Add memory data locking API for libomptarget migration (PR #173138)

[Kevin Sala Penades via llvm-commits]

================
@@ -131,3 +136,41 @@ def olMemFill : Function {
     Return<"OL_ERRC_INVALID_SIZE", ["`FillSize % PatternSize != 0`"]>
   ];
 }
+
+def olMemRegister : Function {
----------------
kevinsala wrote:

Please add some tests to check the two new routines.

https://github.com/llvm/llvm-project/pull/173138