[flang][OpenMP][MLIR] Basic support for delayed privatization code-gen

Adds basic support for emitting delayed privatizers from flang. So far,
only types of symbols are supported (i.e. scalars), support for more
complicated types will be added later. This also makes sure that
reductio and delayed privatization work properly together by merging the
body-gen callbacks for both in case both clauses are present on the
parallel construct.

Author: ergawy

flang/include/flang/Lower/AbstractConverter.h

@@ -16,6 +16,7 @@
 #include "flang/Common/Fortran.h"
 #include "flang/Lower/LoweringOptions.h"
 #include "flang/Lower/PFTDefs.h"
+#include "flang/Lower/SymbolMap.h"
 #include "flang/Optimizer/Builder/BoxValue.h"
 #include "flang/Semantics/symbol.h"
 #include "mlir/IR/Builders.h"
@@ -296,6 +297,9 @@ class AbstractConverter {
     return loweringOptions;
   }
 
+  virtual Fortran::lower::SymbolBox
+  lookupOneLevelUpSymbol(const Fortran::semantics::Symbol &sym) = 0;
+
 private:
   /// Options controlling lowering behavior.
   const Fortran::lower::LoweringOptions &loweringOptions;

flang/lib/Lower/Bridge.cpp

@@ -1070,7 +1070,7 @@ class FirConverter : public Fortran::lower::AbstractConverter {
   /// Find the symbol in one level up of symbol map such as for host-association
   /// in OpenMP code or return null.
   Fortran::lower::SymbolBox
-  lookupOneLevelUpSymbol(const Fortran::semantics::Symbol &sym) {
+  lookupOneLevelUpSymbol(const Fortran::semantics::Symbol &sym) override {
     if (Fortran::lower::SymbolBox v = localSymbols.lookupOneLevelUpSymbol(sym))
       return v;
     return {};