Revert "[Modules TS] Module ownership semantics for redeclarations."

This reverts commit r315251. See the original commit thread for reason.

llvm-svn: 315309
diff --git a/clang/lib/Sema/SemaOpenMP.cpp b/clang/lib/Sema/SemaOpenMP.cpp
index a024888..4ab78f1 100644
--- a/clang/lib/Sema/SemaOpenMP.cpp
+++ b/clang/lib/Sema/SemaOpenMP.cpp
@@ -11539,7 +11539,7 @@
   Decls.reserve(ReductionTypes.size());
 
   LookupResult Lookup(*this, Name, SourceLocation(), LookupOMPReductionName,
-                      forRedeclarationInCurContext());
+                      ForRedeclaration);
   // [OpenMP 4.0], 2.15 declare reduction Directive, Restrictions
   // A reduction-identifier may not be re-declared in the current scope for the
   // same type or for a type that is compatible according to the base language