[compiler-rt] [NFC][tsan] Use the result of placement new (PR #86341)

[Vitaly Buka via llvm-commits]

https://github.com/vitalybuka created https://github.com/llvm/llvm-project/pull/86341

None

>From 6a4a53eb188ecc6fd3a8c0e799ea323a39ca58e1 Mon Sep 17 00:00:00 2001
From: Vitaly Buka <vitalybuka at google.com>
Date: Fri, 22 Mar 2024 14:30:16 -0700
Subject: [PATCH] =?UTF-8?q?[=F0=9D=98=80=F0=9D=97=BD=F0=9D=97=BF]=20initia?=
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Created using spr 1.3.4
---
 compiler-rt/lib/tsan/rtl/tsan_rtl_thread.cpp | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/compiler-rt/lib/tsan/rtl/tsan_rtl_thread.cpp b/compiler-rt/lib/tsan/rtl/tsan_rtl_thread.cpp
index 77488f84328542..06c34a2e438388 100644
--- a/compiler-rt/lib/tsan/rtl/tsan_rtl_thread.cpp
+++ b/compiler-rt/lib/tsan/rtl/tsan_rtl_thread.cpp
@@ -200,9 +200,8 @@ void ThreadStart(ThreadState *thr, Tid tid, tid_t os_id,
 }
 
 void ThreadContext::OnStarted(void *arg) {
-  thr = static_cast<ThreadState *>(arg);
   DPrintf("#%d: ThreadStart\n", tid);
-  new (thr) ThreadState(tid);
+  thr = new (arg) ThreadState(tid);
   if (common_flags()->detect_deadlocks)
     thr->dd_lt = ctx->dd->CreateLogicalThread(tid);
   thr->tctx = this;