[clang[OpenMP] Revert accidentally included changes from previous commit

Author: kparzysz

clang/lib/Sema/SemaOpenMP.cpp

@@ -18601,22 +18601,14 @@ OMPClause *SemaOpenMP::ActOnOpenMPReductionClause(
   // worksharing-loop construct, a worksharing-loop SIMD construct, a simd
   // construct, a parallel worksharing-loop construct or a parallel
   // worksharing-loop SIMD construct.
-  // [5.2:136:1-4] A reduction clause with the inscan reduction-modifier may
-  // only appear on a worksharing-loop construct, a simd construct or a
-  // combined or composite construct for which any of the aforementioned
-  // constructs is a constituent construct and distribute is not a constituent
-  // construct.
-  if (Modifier == OMPC_REDUCTION_inscan) {
-    SmallVector<OpenMPDirectiveKind, 4> LeafOrComposite;
-    ArrayRef<OpenMPDirectiveKind> CurrentLOC = getLeafOrCompositeConstructs(
-        DSAStack->getCurrentDirective(), LeafOrComposite);
-    bool Valid = llvm::any_of(CurrentLOC, [](OpenMPDirectiveKind DK) {
-      return llvm::is_contained({OMPD_for, OMPD_simd, OMPD_for_simd}, DK);
-    });
-    if (!Valid) {
-      Diag(ModifierLoc, diag::err_omp_wrong_inscan_reduction);
-      return nullptr;
-    }
+  if (Modifier == OMPC_REDUCTION_inscan &&
+      (DSAStack->getCurrentDirective() != OMPD_for &&
+       DSAStack->getCurrentDirective() != OMPD_for_simd &&
+       DSAStack->getCurrentDirective() != OMPD_simd &&
+       DSAStack->getCurrentDirective() != OMPD_parallel_for &&
+       DSAStack->getCurrentDirective() != OMPD_parallel_for_simd)) {
+    Diag(ModifierLoc, diag::err_omp_wrong_inscan_reduction);
+    return nullptr;
   }
 
   ReductionData RD(VarList.size(), Modifier);