[clang] [OpenMP] Add runtime selection for metadirective with non-constant conditions. (PR #192455)

[Alexey Bataev via cfe-commits]

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@@ -6374,28 +6374,70 @@ class OMPMaskedDirective final : public OMPExecutableDirective {
 ///
 class OMPMetaDirective final : public OMPExecutableDirective {
   friend class ASTStmtReader;
+  friend class ASTStmtWriter;
   friend class OMPExecutableDirective;
-  Stmt *IfStmt;
+  unsigned NumVariants;
+  OpenMPDirectiveKind *DirectiveKinds;
+  Expr **Conditions;
+  Stmt **VariantDirectives;
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alexey-bataev wrote:

These should be tail allocated, otherwise children cannot be build correctly

https://github.com/llvm/llvm-project/pull/192455