llvm: add Policy::NeverIncludeTypeForTemplateArgument.

This is necessary to allow ROOT normalized names to never have the type suffix added to
integral template arguments.

Author: pcanal

interpreter/llvm-project/clang/include/clang/AST/PrettyPrinter.h

@@ -76,6 +76,7 @@ struct PrintingPolicy {
         SuppressImplicitBase(false), FullyQualifiedName(false),
         PrintCanonicalTypes(false), PrintInjectedClassNameWithArguments(true),
         UsePreferredNames(true), AlwaysIncludeTypeForTemplateArgument(false),
+        NeverIncludeTypeForTemplateArgument(false),
         CleanUglifiedParameters(false), EntireContentsOfLargeArray(true),
         UseEnumerators(true) {}
 
@@ -326,6 +327,13 @@ struct PrintingPolicy {
   LLVM_PREFERRED_TYPE(bool)
   unsigned AlwaysIncludeTypeForTemplateArgument : 1;
 
+  /// Whether to never use type suffixes (eg: 1U) on integral non-type template
+  /// parameters.  This is useful to cancel the behavior of
+  /// TemplateParameterList::shouldIncludeTypeForArgument sometimes request the
+  /// type suffix even if AlwaysIncludeTypeForTemplateArgument is not true.
+  LLVM_PREFERRED_TYPE(bool)
+  unsigned NeverIncludeTypeForTemplateArgument : 1;
+
   /// Whether to strip underscores when printing reserved parameter names.
   /// e.g. std::vector<class _Tp> becomes std::vector<class Tp>.
   /// This only affects parameter names, and so describes a compatible API.

interpreter/llvm-project/clang/lib/AST/DeclTemplate.cpp

@@ -240,6 +240,8 @@ bool TemplateParameterList::hasAssociatedConstraints() const {
 bool TemplateParameterList::shouldIncludeTypeForArgument(
     const PrintingPolicy &Policy, const TemplateParameterList *TPL,
     unsigned Idx) {
+  if (Policy.NeverIncludeTypeForTemplateArgument)
+    return false;
   if (!TPL || Idx >= TPL->size() || Policy.AlwaysIncludeTypeForTemplateArgument)
     return true;
   const NamedDecl *TemplParam = TPL->getParam(Idx);