[clang][OpenMP] Add 'align' modifier for 'allocate' clause (#121814)

The 'align' modifier is now accepted in the 'allocate' clause. Added LIT
tests covering codegen, PCH, template handling, and serialization for
'align' modifier.

Added support for align-modifier to release notes.

Testing
- New allocate modifier LIT tests.
- OpenMP LIT tests.
- check-all

1 files changed, 3 insertions, 1 deletions

diff --git a/clang/lib/Serialization/ASTWriter.cpp b/clang/lib/Serialization/ASTWriter.cpp
index 39004fd..345d496 100644
--- a/clang/lib/Serialization/ASTWriter.cpp
+++ b/clang/lib/Serialization/ASTWriter.cpp
@@ -7924,10 +7924,12 @@ void OMPClauseWriter::VisitOMPMapClause(OMPMapClause *C) {
 
 void OMPClauseWriter::VisitOMPAllocateClause(OMPAllocateClause *C) {
   Record.push_back(C->varlist_size());
-  Record.writeEnum(C->getAllocatorModifier());
+  Record.writeEnum(C->getFirstAllocateModifier());
+  Record.writeEnum(C->getSecondAllocateModifier());
   Record.AddSourceLocation(C->getLParenLoc());
   Record.AddSourceLocation(C->getColonLoc());
   Record.AddStmt(C->getAllocator());
+  Record.AddStmt(C->getAlignment());
   for (auto *VE : C->varlist())
     Record.AddStmt(VE);
 }