[clang] [AST] Migrate away from PointerUnion::dyn_cast (NFC) (PR #123499)

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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 Init to be nonnull.  Note that hasInit returns true
only if Init is nonnull among other conditions.


---
Full diff: https://github.com/llvm/llvm-project/pull/123499.diff


1 Files Affected:

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


``````````diff
diff --git a/clang/lib/AST/Decl.cpp b/clang/lib/AST/Decl.cpp
index 30341b046f95e3..f641a72ed26448 100644
--- a/clang/lib/AST/Decl.cpp
+++ b/clang/lib/AST/Decl.cpp
@@ -2399,7 +2399,7 @@ Expr *VarDecl::getInit() {
   if (!hasInit())
     return nullptr;
 
-  if (auto *S = Init.dyn_cast<Stmt *>())
+  if (auto *S = dyn_cast<Stmt *>(Init))
     return cast<Expr>(S);
 
   auto *Eval = getEvaluatedStmt();

``````````

</details>


https://github.com/llvm/llvm-project/pull/123499
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