[LLVMIR] Avoid repeated hash lookups (NFC)

[kazutakahirata]

No description provided.

[llvmbot]

@llvm/pr-subscribers-mlir

@llvm/pr-subscribers-mlir-llvm

Author: Kazu Hirata (kazutakahirata)

Changes

---

Full diff: https://github.com/llvm/llvm-project/pull/107428.diff

1 Files Affected:

• (modified) mlir/lib/Target/LLVMIR/ModuleImport.cpp (+2-3)

diff --git a/mlir/lib/Target/LLVMIR/ModuleImport.cpp b/mlir/lib/Target/LLVMIR/ModuleImport.cpp
index bd761650534880..d1732cb808928a 100644
--- a/mlir/lib/Target/LLVMIR/ModuleImport.cpp
+++ b/mlir/lib/Target/LLVMIR/ModuleImport.cpp
@@ -1021,9 +1021,8 @@ ModuleImport::getConstantsToConvert(llvm::Constant *constant) {
     llvm::Constant *current = workList.back();
     // Collect all dependencies of the current constant and add them to the
     // adjacency list if none has been computed before.
-    auto adjacencyIt = adjacencyLists.find(current);
-    if (adjacencyIt == adjacencyLists.end()) {
-      adjacencyIt = adjacencyLists.try_emplace(current).first;
+    auto [adjacencyIt, inserted] = adjacencyLists.try_emplace(current);
+    if (inserted) {
       // Add all constant operands to the adjacency list and skip any other
       // values such as basic block addresses.
       for (llvm::Value *operand : current->operands())