[compiler-rt] [asan][win] Fix CreateThread leak (PR #126738)

[via llvm-commits]

https://github.com/GkvJwa created https://github.com/llvm/llvm-project/pull/126738

Fix #126541

Since ```t->Destroy``` cannot be called after ```start_routine```(When calling standard thread_start in crt), the func is run in advance to avoid memory leaks and remain the same as before.

>From 04e92792339262f4a97e83357db464dec647618c Mon Sep 17 00:00:00 2001
From: GkvJwa <gkvjwa at gmail.com>
Date: Tue, 11 Feb 2025 22:31:12 +0800
Subject: [PATCH] [asan][win] Fix ExitThread leak

---
 compiler-rt/lib/asan/asan_win.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/compiler-rt/lib/asan/asan_win.cpp b/compiler-rt/lib/asan/asan_win.cpp
index 09a13b11cff1f..d043bb822d2cf 100644
--- a/compiler-rt/lib/asan/asan_win.cpp
+++ b/compiler-rt/lib/asan/asan_win.cpp
@@ -143,9 +143,11 @@ static thread_return_t THREAD_CALLING_CONV asan_thread_start(void *arg) {
 
   ThreadStartParams params;
   t->GetStartData(params);
+  // The ExitThread will end the current thread, causing destroy to be unable to
+  // be called.
+  t->Destroy();
 
   auto res = (*params.start_routine)(params.arg);
-  t->Destroy();  // POSIX calls this from TSD destructor.
   return res;
 }