[OPENMP]Use cast instead dyn_cast, NFC.
Here the expression is always a DeclRefExpr, no need to use dyn_cast.
diff --git a/clang/lib/Sema/SemaOpenMP.cpp b/clang/lib/Sema/SemaOpenMP.cpp
index 2773efc..50d9ab9 100644
--- a/clang/lib/Sema/SemaOpenMP.cpp
+++ b/clang/lib/Sema/SemaOpenMP.cpp
@@ -5445,7 +5445,7 @@
Func->specific_attrs<OMPDeclareVariantAttr>()) {
// TODO: add checks for active OpenMP context where possible.
Expr *VariantRef = A->getVariantFuncRef();
- auto *DRE = dyn_cast<DeclRefExpr>(VariantRef->IgnoreParenImpCasts());
+ auto *DRE = cast<DeclRefExpr>(VariantRef->IgnoreParenImpCasts());
auto *F = cast<FunctionDecl>(DRE->getDecl());
if (!F->isDefined() && F->isTemplateInstantiation())
InstantiateFunctionDefinition(Loc, F->getFirstDecl());