[llvm] [GlobalOpt] Use cast instead of dyn_cast. NFC (PR #144634)

[via llvm-commits]

llvmbot wrote:


<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-llvm-transforms

Author: Craig Topper (topperc)

<details>
<summary>Changes</summary>

The dyn_cast was not checked for null, and the cast is guaranteed to succeed by an earlier check.

---
Full diff: https://github.com/llvm/llvm-project/pull/144634.diff


1 Files Affected:

- (modified) llvm/lib/Transforms/IPO/GlobalOpt.cpp (+1-1) 


``````````diff
diff --git a/llvm/lib/Transforms/IPO/GlobalOpt.cpp b/llvm/lib/Transforms/IPO/GlobalOpt.cpp
index 7db0586386506..4a06e0fa619c0 100644
--- a/llvm/lib/Transforms/IPO/GlobalOpt.cpp
+++ b/llvm/lib/Transforms/IPO/GlobalOpt.cpp
@@ -2169,7 +2169,7 @@ static bool tryWidenGlobalArraysUsedByMemcpy(
 
     unsigned NumBytesToCopy = BytesToCopyOp->getZExtValue();
 
-    auto *Alloca = dyn_cast<AllocaInst>(CI->getArgOperand(0));
+    auto *Alloca = cast<AllocaInst>(CI->getArgOperand(0));
     uint64_t DZSize = Alloca->getAllocatedType()->getArrayNumElements();
     uint64_t SZSize = SourceDataArray->getType()->getNumElements();
     unsigned ElementByteWidth = SourceDataArray->getElementByteSize();

``````````

</details>


https://github.com/llvm/llvm-project/pull/144634