[mlir] Use *Map::try_emplace (NFC) (#143341)

- try_emplace(Key) is shorter than insert({Key, nullptr}).
- try_emplace performs value initialization without value parameters.
- We overwrite values on successful insertion anyway.

1 files changed, 2 insertions, 2 deletions

diff --git a/mlir/lib/Bytecode/Writer/IRNumbering.cpp b/mlir/lib/Bytecode/Writer/IRNumbering.cpp
index 1bc02e172157..8e8e7148ee70 100644
--- a/mlir/lib/Bytecode/Writer/IRNumbering.cpp
+++ b/mlir/lib/Bytecode/Writer/IRNumbering.cpp
@@ -308,7 +308,7 @@ void IRNumberingState::computeGlobalNumberingState(Operation *rootOp) {
 }
 
 void IRNumberingState::number(Attribute attr) {
-  auto it = attrs.insert({attr, nullptr});
+  auto it = attrs.try_emplace(attr);
   if (!it.second) {
     ++it.first->second->refCount;
     return;
@@ -475,7 +475,7 @@ void IRNumberingState::number(OperationName opName) {
 }
 
 void IRNumberingState::number(Type type) {
-  auto it = types.insert({type, nullptr});
+  auto it = types.try_emplace(type);
   if (!it.second) {
     ++it.first->second->refCount;
     return;