Revert "[OpenMP] Introduce the initial support for OpenMP kernel language (#66844)"

This reverts commit e997dca3333823ffe2ea3aea288299f551532dcd.

GitOrigin-RevId: 1bff5f6d0bfc1625f45cb7f349803b14b9462bf3
diff --git a/include/llvm/Frontend/OpenMP/OMP.td b/include/llvm/Frontend/OpenMP/OMP.td
index f8b3b0c..a9bfa2f 100644
--- a/include/llvm/Frontend/OpenMP/OMP.td
+++ b/include/llvm/Frontend/OpenMP/OMP.td
@@ -450,10 +450,6 @@
   let clangClass = "OMPXAttributeClause";
 }
 
-def OMPC_OMX_Bare : Clause<"ompx_bare"> {
-  let clangClass = "OMPXBareClause";
-}
-
 //===----------------------------------------------------------------------===//
 // Definition of OpenMP directives
 //===----------------------------------------------------------------------===//
@@ -1524,7 +1520,6 @@
     VersionedClause<OMPC_NumTeams>,
     VersionedClause<OMPC_ThreadLimit>,
     VersionedClause<OMPC_OMPX_DynCGroupMem>,
-    VersionedClause<OMPC_OMX_Bare>,
   ];
 }
 def OMP_TargetTeamsDistribute : Directive<"target teams distribute"> {