[llvm] [DirectX] Avoid a deprecated PointerUnion methods (PR #122972)

[Justin Bogner via llvm-commits]

https://github.com/bogner created https://github.com/llvm/llvm-project/pull/122972

PointerUnion's `is`, `get`, and `dyn_cast` have been deprecated in favour of using `isa`, `cast`, and `dyn_cast` directly. Migrate these uses over.

>From 7b4c006bcbd1cf03340819677ee1694a08f80981 Mon Sep 17 00:00:00 2001
From: Justin Bogner <mail at justinbogner.com>
Date: Tue, 14 Jan 2025 14:29:41 -0700
Subject: [PATCH] [DirectX] Avoid a deprecated PointerUnion methods

PointerUnion's `is`, `get`, and `dyn_cast` have been deprecated in
favour of using `isa`, `cast`, and `dyn_cast` directly. Migrate these
uses over.
---
 llvm/lib/Target/DirectX/DXILWriter/DXILBitcodeWriter.cpp | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/llvm/lib/Target/DirectX/DXILWriter/DXILBitcodeWriter.cpp b/llvm/lib/Target/DirectX/DXILWriter/DXILBitcodeWriter.cpp
index be68d46a876db2..0e064d7227cea8 100644
--- a/llvm/lib/Target/DirectX/DXILWriter/DXILBitcodeWriter.cpp
+++ b/llvm/lib/Target/DirectX/DXILWriter/DXILBitcodeWriter.cpp
@@ -1390,16 +1390,16 @@ void DXILBitcodeWriter::writeDISubrange(const DISubrange *N,
 
   // TODO: Do we need to handle DIExpression here? What about cases where Count
   // isn't specified but UpperBound and such are?
-  ConstantInt *Count = N->getCount().dyn_cast<ConstantInt *>();
+  ConstantInt *Count = dyn_cast<ConstantInt *>(N->getCount());
   assert(Count && "Count is missing or not ConstantInt");
   Record.push_back(Count->getValue().getSExtValue());
 
   // TODO: Similarly, DIExpression is allowed here now
   DISubrange::BoundType LowerBound = N->getLowerBound();
-  assert((LowerBound.isNull() || LowerBound.is<ConstantInt *>()) &&
+  assert((LowerBound.isNull() || isa<ConstantInt *>(LowerBound)) &&
          "Lower bound provided but not ConstantInt");
   Record.push_back(
-      LowerBound ? rotateSign(LowerBound.get<ConstantInt *>()->getValue()) : 0);
+      LowerBound ? rotateSign(cast<ConstantInt *>(LowerBound)->getValue()) : 0);
 
   Stream.EmitRecord(bitc::METADATA_SUBRANGE, Record, Abbrev);
   Record.clear();