[clang] [AST] Migrate away from PointerUnion::dyn_cast (NFC) (PR #124430)

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llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-clang

Author: Kazu Hirata (kazutakahirata)

<details>
<summary>Changes</summary>

Note that PointerUnion::dyn_cast has been soft deprecated in
PointerUnion.h:

  // FIXME: Replace the uses of is(), get() and dyn_cast() with
  //        isa<T>, cast<T> and the llvm::dyn_cast<T>

Literal migration would result in dyn_cast_if_present (see the
definition of PointerUnion::dyn_cast), but this patch uses dyn_cast
because we expect P to be nonnull.


---
Full diff: https://github.com/llvm/llvm-project/pull/124430.diff


1 Files Affected:

- (modified) clang/lib/AST/DeclTemplate.cpp (+1-2) 


``````````diff
diff --git a/clang/lib/AST/DeclTemplate.cpp b/clang/lib/AST/DeclTemplate.cpp
index 2933ba7fb8a295..934176335fe1ab 100644
--- a/clang/lib/AST/DeclTemplate.cpp
+++ b/clang/lib/AST/DeclTemplate.cpp
@@ -1801,8 +1801,7 @@ TemplateParameterList *clang::getReplacedTemplateParameterList(Decl *D) {
   case Decl::Kind::VarTemplateSpecialization: {
     const auto *VTSD = cast<VarTemplateSpecializationDecl>(D);
     auto P = VTSD->getSpecializedTemplateOrPartial();
-    if (const auto *VTPSD =
-            P.dyn_cast<VarTemplatePartialSpecializationDecl *>())
+    if (const auto *VTPSD = dyn_cast<VarTemplatePartialSpecializationDecl *>(P))
       return VTPSD->getTemplateParameters();
     return cast<VarTemplateDecl *>(P)->getTemplateParameters();
   }

``````````

</details>


https://github.com/llvm/llvm-project/pull/124430