[llvm] [Support] Use std::map::try_emplace (NFC) (PR #141374)

[Kazu Hirata via llvm-commits]

https://github.com/kazutakahirata created https://github.com/llvm/llvm-project/pull/141374

try_emplace can default-construct values, so we do not need to do so
on our own.


>From 951e57054fe7851ef5c3e66762a3cda5c10f9f69 Mon Sep 17 00:00:00 2001
From: Kazu Hirata <kazu at google.com>
Date: Sat, 24 May 2025 08:38:52 -0700
Subject: [PATCH] [Support] Use std::map::try_emplace (NFC)

try_emplace can default-construct values, so we do not need to do so
on our own.
---
 llvm/lib/Support/DAGDeltaAlgorithm.cpp | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/llvm/lib/Support/DAGDeltaAlgorithm.cpp b/llvm/lib/Support/DAGDeltaAlgorithm.cpp
index 48302b8cb0621..981536473d124 100644
--- a/llvm/lib/Support/DAGDeltaAlgorithm.cpp
+++ b/llvm/lib/Support/DAGDeltaAlgorithm.cpp
@@ -179,8 +179,8 @@ DAGDeltaAlgorithmImpl::DAGDeltaAlgorithmImpl(
     const std::vector<edge_ty> &Dependencies)
     : DDA(DDA) {
   for (change_ty Change : Changes) {
-    Predecessors.insert(std::make_pair(Change, std::vector<change_ty>()));
-    Successors.insert(std::make_pair(Change, std::vector<change_ty>()));
+    Predecessors.try_emplace(Change);
+    Successors.try_emplace(Change);
   }
   for (const edge_ty &Dep : Dependencies) {
     Predecessors[Dep.second].push_back(Dep.first);
@@ -210,7 +210,7 @@ DAGDeltaAlgorithmImpl::DAGDeltaAlgorithmImpl(
 
   // Invert to form the predecessor closure map.
   for (change_ty Change : Changes)
-    PredClosure.insert(std::make_pair(Change, std::set<change_ty>()));
+    PredClosure.try_emplace(Change);
   for (change_ty Change : Changes)
     for (succ_closure_iterator_ty it2 = succ_closure_begin(Change),
                                   ie2 = succ_closure_end(Change);