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

[Alexey Bataev via llvm-commits]

================
@@ -2712,6 +2714,153 @@ StmtResult Parser::ParseOpenMPDeclarativeOrExecutableDirective(
     // A single match is returned for OpenMP 5.0
     int BestIdx = getBestVariantMatchForContext(VMIs, OMPCtx);
 
+    // Check if we have user conditions with non-constant expressions that
+    // require runtime selection.
+    bool HasUserCondition = llvm::any_of(VMIs, [](const VariantMatchInfo &VMI) {
+      return VMI.HasNonConstantUserCondition;
+    });
+
+    // Different directives have different data-sharing attributes, so each
+    // variant needs its own CapturedStmt with proper DSA context.
+    // We manually cache body tokens and inject them for each variant parse.
+    if (HasUserCondition) {
----------------
alexey-bataev wrote:

```suggestion
    if (HasUserCondition &&
        getLangOpts().OpenMPMetadirectiveRuntimeSelection) {
```

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