[llvm] [NFC][LLVM] Code cleanup in MIRNamerPass.cpp (PR #162996)

[Rahul Joshi via llvm-commits]

https://github.com/jurahul updated https://github.com/llvm/llvm-project/pull/162996

>From cba318e0cb60edb91a31ef42d6c8a823de4c92fe Mon Sep 17 00:00:00 2001
From: Rahul Joshi <rjoshi at nvidia.com>
Date: Sat, 11 Oct 2025 05:05:42 -0700
Subject: [PATCH] [NFC][LLVM] Code cleanup in MIRNamerPass.cpp

---
 llvm/lib/CodeGen/MIRNamerPass.cpp | 17 +++--------------
 1 file changed, 3 insertions(+), 14 deletions(-)

diff --git a/llvm/lib/CodeGen/MIRNamerPass.cpp b/llvm/lib/CodeGen/MIRNamerPass.cpp
index bc65700aba066..cbf8867d569cb 100644
--- a/llvm/lib/CodeGen/MIRNamerPass.cpp
+++ b/llvm/lib/CodeGen/MIRNamerPass.cpp
@@ -23,10 +23,6 @@
 
 using namespace llvm;
 
-namespace llvm {
-extern char &MIRNamerID;
-} // namespace llvm
-
 #define DEBUG_TYPE "mir-namer"
 
 namespace {
@@ -53,10 +49,9 @@ class MIRNamer : public MachineFunctionPass {
 
     VRegRenamer Renamer(MF.getRegInfo());
 
-    unsigned BBIndex = 0;
     ReversePostOrderTraversal<MachineBasicBlock *> RPOT(&*MF.begin());
-    for (auto &MBB : RPOT)
-      Changed |= Renamer.renameVRegs(MBB, BBIndex++);
+    for (const auto &[BBIndex, MBB] : enumerate(RPOT))
+      Changed |= Renamer.renameVRegs(MBB, BBIndex);
 
     return Changed;
   }
@@ -66,10 +61,4 @@ class MIRNamer : public MachineFunctionPass {
 
 char MIRNamer::ID;
 
-char &llvm::MIRNamerID = MIRNamer::ID;
-
-INITIALIZE_PASS_BEGIN(MIRNamer, "mir-namer", "Rename Register Operands", false,
-                      false)
-
-INITIALIZE_PASS_END(MIRNamer, "mir-namer", "Rename Register Operands", false,
-                    false)
+INITIALIZE_PASS(MIRNamer, "mir-namer", "Rename Register Operands", false, false)