[llvm] [InlineSpiller] Drop unused elements in Virt2SiblingsMap. NFC (PR #147866)

[via llvm-commits]

https://github.com/csstormq created https://github.com/llvm/llvm-project/pull/147866

None

>From 3b4bc170a67ec74715a2fe31211b16dddecd29bb Mon Sep 17 00:00:00 2001
From: csstormq <swust_xiaoqiangxu at 163.com>
Date: Wed, 9 Jul 2025 19:15:00 +0800
Subject: [PATCH] [InlineSpiller] Drop unused elements in Virt2SiblingsMap. NFC

---
 llvm/lib/CodeGen/InlineSpiller.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/llvm/lib/CodeGen/InlineSpiller.cpp b/llvm/lib/CodeGen/InlineSpiller.cpp
index ee08dc42dce57..18ec0bc1c050c 100644
--- a/llvm/lib/CodeGen/InlineSpiller.cpp
+++ b/llvm/lib/CodeGen/InlineSpiller.cpp
@@ -1657,7 +1657,7 @@ void HoistSpillHelper::hoistAllSpills() {
   for (unsigned i = 0, e = MRI.getNumVirtRegs(); i != e; ++i) {
     Register Reg = Register::index2VirtReg(i);
     Register Original = VRM.getPreSplitReg(Reg);
-    if (!MRI.def_empty(Reg))
+    if (!MRI.def_empty(Reg) && Original.id())
       Virt2SiblingsMap[Original].insert(Reg);
   }