[Clang][OpenMP] Added the support for target data nowait

[tianshilei1992]

Summary

Previously we added support for target nowait, but target data nowait
has not been supported yet. In this patch, target data nowait will also be
wrapped into a task.

[tianshilei1992]

Fixed a major issue and one test case

[jdoerfert]

LGTM

[tianshilei1992]

Rebased and fixed one test case

[tianshilei1992]

Fixed a rebase error

[tianshilei1992]

Fixed a rebase issue

[tianshilei1992]

Rebased (again) to involve the reversion of another patch that can cause clang crash

[tianshilei1992]

Fixed all failed test cases

[tianshilei1992]

The two failed test cases should have nothing to do with this patch. Will merge this patch.

clang/lib/CodeGen/CGOpenMPRuntime.cpp

auto &&TargetThenGen = [this, &ThenGen, &D, &InputInfo, &MapTypesArray](
 
     // Get map clause information.
     MappableExprsHandler MEHandler(D, CGF);
     MEHandler.generateAllInfo(CombinedInfo);
 
     TargetDataInfo Info;
     // Fill up the arrays and create the arguments.
     emitOffloadingArrays(CGF, CombinedInfo, Info);
-    bool HasDependClauses = D.hasClausesOfKind<OMPDependClause>();
+    const bool RequiresOuterTask = D.hasClausesOfKind<OMPDependClause>() ||
+                                   D.hasClausesOfKind<OMPDependClause>();
     emitOffloadingArraysArgument(CGF, Info.BasePointersArray,
                                  Info.PointersArray, Info.SizesArray,
                                  Info.MapTypesArray, Info.MappersArray, Info,
-                                 {/*ForEndTask=*/false, HasDependClauses});
+                                 {/*ForEndTask=*/false, RequiresOuterTask});
     InputInfo.NumberOfTargetItems = Info.NumberOfPtrs;
     InputInfo.BasePointersArray =
         Address(Info.BasePointersArray, CGM.getPointerAlign());
     InputInfo.PointersArray =
         Address(Info.PointersArray, CGM.getPointerAlign());
     InputInfo.SizesArray =
         Address(Info.SizesArray, CGM.getPointerAlign());
     InputInfo.MappersArray = Address(Info.MappersArray, CGM.getPointerAlign());
     MapTypesArray = Info.MapTypesArray;
-    if (HasDependClauses)
+    if (RequiresOuterTask)
       CGF.EmitOMPTargetTaskBasedDirective(D, ThenGen, InputInfo);
     else
       emitInlinedDirective(CGF, D.getDirectiveKind(), ThenGen);
   };
 
   if (IfCond) {
     emitIfClause(CGF, IfCond, TargetThenGen,
                  [](CodeGenFunction &CGF, PrePostActionTy &) {});