[flang][OpenMP] Rename enum OmpxHold to Ompx_Hold in parser (#113366)

The convention is to use enum names that match the source spelling (up
to upper/lower case), including names with underscores.

Remove the special case from unparser, update tests.

Author: kparzysz

flang/include/flang/Parser/parse-tree.h

@@ -3455,7 +3455,7 @@ WRAPPER_CLASS(OmpObjectList, std::list<OmpObject>);
 // map-type-modifier -> ALWAYS | CLOSE | PRESENT | OMPX_HOLD
 // map-type -> TO | FROM | TOFROM | ALLOC | RELEASE | DELETE
 struct OmpMapClause {
-  ENUM_CLASS(TypeModifier, Always, Close, Present, OmpxHold);
+  ENUM_CLASS(TypeModifier, Always, Close, Present, Ompx_Hold);
   ENUM_CLASS(Type, To, From, Tofrom, Alloc, Release, Delete)
   TUPLE_CLASS_BOILERPLATE(OmpMapClause);
   std::tuple<std::optional<std::list<TypeModifier>>, std::optional<Type>,

flang/lib/Lower/OpenMP/Clauses.cpp

@@ -843,10 +843,10 @@ Map make(const parser::OmpClause::Map &inp,
   CLAUSET_ENUM_CONVERT( //
       convert2, parser::OmpMapClause::TypeModifier, Map::MapTypeModifier,
       // clang-format off
-      MS(Always,   Always)
-      MS(Close,    Close)
-      MS(OmpxHold, OmpxHold)
-      MS(Present,  Present)
+      MS(Always,    Always)
+      MS(Close,     Close)
+      MS(Ompx_Hold, OmpxHold)
+      MS(Present,   Present)
       // clang-format on
   );
 

flang/lib/Parser/openmp-parsers.cpp

@@ -110,7 +110,7 @@ TYPE_PARSER(construct<OmpProcBindClause>(
 TYPE_PARSER(construct<OmpMapClause::TypeModifier>(
     "ALWAYS" >> pure(OmpMapClause::TypeModifier::Always) ||
     "CLOSE" >> pure(OmpMapClause::TypeModifier::Close) ||
-    "OMPX_HOLD" >> pure(OmpMapClause::TypeModifier::OmpxHold) ||
+    "OMPX_HOLD" >> pure(OmpMapClause::TypeModifier::Ompx_Hold) ||
     "PRESENT" >> pure(OmpMapClause::TypeModifier::Present)))
 
 TYPE_PARSER(

flang/lib/Parser/unparse.cpp

@@ -2087,13 +2087,6 @@ class UnparseVisitor {
     }
     Walk(std::get<OmpObjectList>(x.t));
   }
-  void Unparse(const OmpMapClause::TypeModifier &x) {
-    if (x == OmpMapClause::TypeModifier::OmpxHold) {
-      Word("OMPX_HOLD");
-    } else {
-      Word(OmpMapClause::EnumToString(x));
-    }
-  }
   void Unparse(const OmpScheduleModifier &x) {
     Walk(std::get<OmpScheduleModifier::Modifier1>(x.t));
     Walk(",", std::get<std::optional<OmpScheduleModifier::Modifier2>>(x.t));
@@ -2801,6 +2794,7 @@ class UnparseVisitor {
   WALK_NESTED_ENUM(OmpOrderClause, Type) // OMP order-type
   WALK_NESTED_ENUM(OmpOrderModifier, Kind) // OMP order-modifier
   WALK_NESTED_ENUM(OmpMapClause, Type) // OMP map-type
+  WALK_NESTED_ENUM(OmpMapClause, TypeModifier) // OMP map-type-modifier
 #undef WALK_NESTED_ENUM
   void Unparse(const ReductionOperator::Operator x) {
     switch (x) {

flang/test/Parser/OpenMP/map-modifiers.f90

@@ -18,7 +18,7 @@ subroutine f00(x)
 !PARSE-TREE: OmpBeginBlockDirective
 !PARSE-TREE: | OmpBlockDirective -> llvm::omp::Directive = target
 !PARSE-TREE: | OmpClauseList -> OmpClause -> Map -> OmpMapClause
-!PARSE-TREE: | | TypeModifier = OmpxHold
+!PARSE-TREE: | | TypeModifier = Ompx_Hold
 !PARSE-TREE: | | TypeModifier = Always
 !PARSE-TREE: | | TypeModifier = Present
 !PARSE-TREE: | | TypeModifier = Close
@@ -42,7 +42,7 @@ subroutine f01(x)
 !PARSE-TREE: OmpBeginBlockDirective
 !PARSE-TREE: | OmpBlockDirective -> llvm::omp::Directive = target
 !PARSE-TREE: | OmpClauseList -> OmpClause -> Map -> OmpMapClause
-!PARSE-TREE: | | TypeModifier = OmpxHold
+!PARSE-TREE: | | TypeModifier = Ompx_Hold
 !PARSE-TREE: | | TypeModifier = Always
 !PARSE-TREE: | | TypeModifier = Present
 !PARSE-TREE: | | TypeModifier = Close
@@ -104,7 +104,7 @@ subroutine f10(x)
 !PARSE-TREE: OmpBeginBlockDirective
 !PARSE-TREE: | OmpBlockDirective -> llvm::omp::Directive = target
 !PARSE-TREE: | OmpClauseList -> OmpClause -> Map -> OmpMapClause
-!PARSE-TREE: | | TypeModifier = OmpxHold
+!PARSE-TREE: | | TypeModifier = Ompx_Hold
 !PARSE-TREE: | | TypeModifier = Always
 !PARSE-TREE: | | TypeModifier = Present
 !PARSE-TREE: | | TypeModifier = Close
@@ -128,7 +128,7 @@ subroutine f11(x)
 !PARSE-TREE: OmpBeginBlockDirective
 !PARSE-TREE: | OmpBlockDirective -> llvm::omp::Directive = target
 !PARSE-TREE: | OmpClauseList -> OmpClause -> Map -> OmpMapClause
-!PARSE-TREE: | | TypeModifier = OmpxHold
+!PARSE-TREE: | | TypeModifier = Ompx_Hold
 !PARSE-TREE: | | TypeModifier = Always
 !PARSE-TREE: | | TypeModifier = Present
 !PARSE-TREE: | | TypeModifier = Close