[clang] [CodeGen] Migrate away from PointerUnion::dyn_cast (NFC) (PR #122778)

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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 Prototype.P to be nonnull.


---
Full diff: https://github.com/llvm/llvm-project/pull/122778.diff


1 Files Affected:

- (modified) clang/lib/CodeGen/CGCall.cpp (+1-1) 


``````````diff
diff --git a/clang/lib/CodeGen/CGCall.cpp b/clang/lib/CodeGen/CGCall.cpp
index 0fde4d8ee296bd..e0cf6ca69f0df2 100644
--- a/clang/lib/CodeGen/CGCall.cpp
+++ b/clang/lib/CodeGen/CGCall.cpp
@@ -4507,7 +4507,7 @@ void CodeGenFunction::EmitCallArgs(
   // First, if a prototype was provided, use those argument types.
   bool IsVariadic = false;
   if (Prototype.P) {
-    const auto *MD = Prototype.P.dyn_cast<const ObjCMethodDecl *>();
+    const auto *MD = dyn_cast<const ObjCMethodDecl *>(Prototype.P);
     if (MD) {
       IsVariadic = MD->isVariadic();
       ExplicitCC = getCallingConventionForDecl(

``````````

</details>


https://github.com/llvm/llvm-project/pull/122778
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