[llvm] PowerPC: Use use_instr_nodbg_begin in PPCReduceCRLogicals (PR #219988)

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<!--LLVM PR SUMMARY COMMENT-->

@llvm/pr-subscribers-backend-powerpc

Author: Matt Arsenault (arsenm)

<details>
<summary>Changes</summary>

Fetch the using instruction directly through the instruction iterator
instead of dereferencing an operand's parent.

Co-authored-by: Claude (Claude-Opus-4.8)

---
Full diff: https://github.com/llvm/llvm-project/pull/219988.diff


1 Files Affected:

- (modified) llvm/lib/Target/PowerPC/PPCReduceCRLogicals.cpp (+1-1) 


``````````diff
diff --git a/llvm/lib/Target/PowerPC/PPCReduceCRLogicals.cpp b/llvm/lib/Target/PowerPC/PPCReduceCRLogicals.cpp
index 83e3dbf2b2e56..233649296389c 100644
--- a/llvm/lib/Target/PowerPC/PPCReduceCRLogicals.cpp
+++ b/llvm/lib/Target/PowerPC/PPCReduceCRLogicals.cpp
@@ -655,7 +655,7 @@ bool PPCReduceCRLogicals::splitBlockOnBinaryCROp(CRLogicalOpInfo &CRI) {
 
   // Get the branch instruction.
   MachineInstr *Branch =
-    MRI->use_nodbg_begin(CRI.MI->getOperand(0).getReg())->getParent();
+      &*MRI->use_instr_nodbg_begin(CRI.MI->getOperand(0).getReg());
 
   // We want the new block to have no code in it other than the definition
   // of the input to the CR logical and the CR logical itself. So we move

``````````

</details>


https://github.com/llvm/llvm-project/pull/219988