[CodeGen] Use *Set::insert_range (NFC) (#132651)

We can use *Set::insert_range to collapse:

  for (auto Elem : Range)
    Set.insert(E);

down to:

  Set.insert_range(Range);

1 files changed, 1 insertions, 2 deletions

diff --git a/llvm/lib/CodeGen/CodeGenPrepare.cpp b/llvm/lib/CodeGen/CodeGenPrepare.cpp
index e3d6a5e..5ec7000 100644
--- a/llvm/lib/CodeGen/CodeGenPrepare.cpp
+++ b/llvm/lib/CodeGen/CodeGenPrepare.cpp
@@ -6809,8 +6809,7 @@ bool CodeGenPrepare::optimizePhiType(
   }
 
   // Save the removed phis to be deleted later.
-  for (PHINode *Phi : PhiNodes)
-    DeletedInstrs.insert(Phi);
+  DeletedInstrs.insert_range(PhiNodes);
   return true;
 }