[clang] [Sema] Migrate away from PointerUnion::dyn_cast (NFC) (PR #124883)

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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;

This patch migrates the use of PointerUnion::dyn_cast to
dyn_cast_if_present because ShadowMapEntry::Add starts with:

  if (DeclOrVector.isNull()) {

implying that DeclOrVector is not guaranteed to be nonnull.


---
Full diff: https://github.com/llvm/llvm-project/pull/124883.diff


1 Files Affected:

- (modified) clang/lib/Sema/SemaCodeComplete.cpp (+1-1) 


``````````diff
diff --git a/clang/lib/Sema/SemaCodeComplete.cpp 
b/clang/lib/Sema/SemaCodeComplete.cpp
index bc0f6a9435f958..f10f7f4768f8e8 100644
--- a/clang/lib/Sema/SemaCodeComplete.cpp
+++ b/clang/lib/Sema/SemaCodeComplete.cpp
@@ -137,7 +137,7 @@ class ResultBuilder {
 
     ~ShadowMapEntry() {
       if (DeclIndexPairVector *Vec =
-              DeclOrVector.dyn_cast<DeclIndexPairVector *>()) {
+              dyn_cast_if_present<DeclIndexPairVector *>(DeclOrVector)) {
         delete Vec;
         DeclOrVector = ((NamedDecl *)nullptr);
       }

``````````

</details>


https://github.com/llvm/llvm-project/pull/124883
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