[clang] [AST] Migrate away from PointerUnion::dyn_cast (NFC) (PR #123012)

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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&lt;T&gt;, cast&lt;T&gt; and the llvm::dyn_cast&lt;T&gt;

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/123012.diff


1 Files Affected:

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


``````````diff
diff --git a/clang/lib/AST/ASTImporter.cpp b/clang/lib/AST/ASTImporter.cpp
index dec4c7221bc776..0669aa1b809c34 100644
--- a/clang/lib/AST/ASTImporter.cpp
+++ b/clang/lib/AST/ASTImporter.cpp
@@ -6376,7 +6376,7 @@ ExpectedDecl 
ASTNodeImporter::VisitClassTemplateSpecializationDecl(
   D2->setTemplateSpecializationKind(D->getTemplateSpecializationKind());
 
   if (auto P = D->getInstantiatedFrom()) {
-    if (auto *CTD = P.dyn_cast<ClassTemplateDecl *>()) {
+    if (auto *CTD = dyn_cast<ClassTemplateDecl *>(P)) {
       if (auto CTDorErr = import(CTD))
         D2->setInstantiationOf(*CTDorErr);
     } else {

``````````

</details>


https://github.com/llvm/llvm-project/pull/123012
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