[clang] [clang] Migrate away from PointerUnion::{is, get} (NFC) (PR #119724)

[Kazu Hirata via cfe-commits]

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@@ -486,10 +486,10 @@ enum class TemplateSubstitutionKind : char {
         const Decl *D = I->first;
         llvm::PointerUnion<Decl *, DeclArgumentPack *> &Stored =
           newScope->LocalDecls[D];
-        if (I->second.is<Decl *>()) {
-          Stored = I->second.get<Decl *>();
+        if (isa<Decl *>(I->second)) {
+          Stored = cast<Decl *>(I->second);
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kazutakahirata wrote:

Thank you for pointing this out!  Fixed in the latest iteration.

https://github.com/llvm/llvm-project/pull/119724