[memprof] std::move matchings (NFC)

[kazutakahirata]

We do not modify Matchings after we call try_emplace, so we can just
std::move Matchings.

[llvmbot]

@llvm/pr-subscribers-llvm-transforms

Author: Kazu Hirata (kazutakahirata)

Changes

We do not modify Matchings after we call try_emplace, so we can just
std::move Matchings.

---

Full diff: https://github.com/llvm/llvm-project/pull/128933.diff

1 Files Affected:

• (modified) llvm/lib/Transforms/Instrumentation/MemProfiler.cpp (+2-1)

diff --git a/llvm/lib/Transforms/Instrumentation/MemProfiler.cpp b/llvm/lib/Transforms/Instrumentation/MemProfiler.cpp
index 7d8bc3aa4c589..8149f55b46274 100644
--- a/llvm/lib/Transforms/Instrumentation/MemProfiler.cpp
+++ b/llvm/lib/Transforms/Instrumentation/MemProfiler.cpp
@@ -929,7 +929,8 @@ memprof::computeUndriftMap(Module &M, IndexedInstrProfReader *MemProfReader,
     longestCommonSequence<LineLocation, GlobalValue::GUID>(
         ProfileAnchors, IRAnchors, std::equal_to<GlobalValue::GUID>(),
         [&](LineLocation A, LineLocation B) { Matchings.try_emplace(A, B); });
-    bool Inserted = UndriftMaps.try_emplace(CallerGUID, Matchings).second;
+    bool Inserted =
+        UndriftMaps.try_emplace(CallerGUID, std::move(Matchings)).second;
 
     // The insertion must succeed because we visit each GUID exactly once.
     assert(Inserted);

[snehasish]

lgtm