[OMPIRBuilder][Debug] Remove unnecessary code. (llvm#156468)

In the code that fix ups the debug information, we handles both the
debug intrinsics and debug records. The debug intrinsics are being
phased out and I recently changed mlir translation to not generate them.
This means that we should not get debug intrinsics anymore and code can
be simplified by removing their handling.

Author: abidh

llvm/lib/Frontend/OpenMP/OMPIRBuilder.cpp

@@ -7382,9 +7382,8 @@ static void FixupDebugInfoForOutlinedFunction(
   // The location and scope of variable intrinsics and records still point to
   // the parent function of the target region. Update them.
   for (Instruction &I : instructions(Func)) {
-    if (auto *DDI = dyn_cast<llvm::DbgVariableIntrinsic>(&I))
-      UpdateDebugRecord(DDI);
-
+    assert(!isa<llvm::DbgVariableIntrinsic>(&I) &&
+           "Unexpected debug intrinsic");
     for (DbgVariableRecord &DVR : filterDbgVars(I.getDbgRecordRange()))
       UpdateDebugRecord(&DVR);
   }