[CodeGen] Remove atEnd method from defusechain iterators (#120610)

This was not used much and there are better ways of writing it.

1 files changed, 4 insertions, 5 deletions

diff --git a/llvm/lib/CodeGen/MachineTraceMetrics.cpp b/llvm/lib/CodeGen/MachineTraceMetrics.cpp
index 6576f97..021c1a0 100644
--- a/llvm/lib/CodeGen/MachineTraceMetrics.cpp
+++ b/llvm/lib/CodeGen/MachineTraceMetrics.cpp
@@ -683,11 +683,10 @@ struct DataDep {
   DataDep(const MachineRegisterInfo *MRI, unsigned VirtReg, unsigned UseOp)
     : UseOp(UseOp) {
     assert(Register::isVirtualRegister(VirtReg));
-    MachineRegisterInfo::def_iterator DefI = MRI->def_begin(VirtReg);
-    assert(!DefI.atEnd() && "Register has no defs");
-    DefMI = DefI->getParent();
-    DefOp = DefI.getOperandNo();
-    assert((++DefI).atEnd() && "Register has multiple defs");
+    MachineOperand *DefMO = MRI->getOneDef(VirtReg);
+    assert(DefMO && "Register does not have unique def");
+    DefMI = DefMO->getParent();
+    DefOp = DefMO->getOperandNo();
   }
 };