[llvm] [XRay] Avoid repeated hash lookups (NFC) (PR #111786)

[Kazu Hirata via llvm-commits]

https://github.com/kazutakahirata created https://github.com/llvm/llvm-project/pull/111786

None

>From 17b6a5be32c2262fc1e9f50dbac3fab96ead6ce9 Mon Sep 17 00:00:00 2001
From: Kazu Hirata <kazu at google.com>
Date: Wed, 9 Oct 2024 07:08:49 -0700
Subject: [PATCH] [XRay] Avoid repeated hash lookups (NFC)

---
 llvm/lib/XRay/BlockIndexer.cpp | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/llvm/lib/XRay/BlockIndexer.cpp b/llvm/lib/XRay/BlockIndexer.cpp
index a99a6815f0d16b..f4ba0eb5bda9cf 100644
--- a/llvm/lib/XRay/BlockIndexer.cpp
+++ b/llvm/lib/XRay/BlockIndexer.cpp
@@ -80,12 +80,9 @@ Error BlockIndexer::visit(FunctionRecord &R) {
 }
 
 Error BlockIndexer::flush() {
-  Index::iterator It;
-  std::tie(It, std::ignore) =
-      Indices.insert({{CurrentBlock.ProcessID, CurrentBlock.ThreadID}, {}});
-  It->second.push_back({CurrentBlock.ProcessID, CurrentBlock.ThreadID,
-                        CurrentBlock.WallclockTime,
-                        std::move(CurrentBlock.Records)});
+  Indices[{CurrentBlock.ProcessID, CurrentBlock.ThreadID}].push_back(
+      {CurrentBlock.ProcessID, CurrentBlock.ThreadID,
+       CurrentBlock.WallclockTime, std::move(CurrentBlock.Records)});
   CurrentBlock.ProcessID = 0;
   CurrentBlock.ThreadID = 0;
   CurrentBlock.Records = {};