Merge branch 'release/19.x' into rethrow_fix_backport

Author: aheejin

compiler-rt/lib/fuzzer/FuzzerUtilWindows.cpp

@@ -239,10 +239,11 @@ size_t PageSize() {
 }
 
 void SetThreadName(std::thread &thread, const std::string &name) {
-#if defined(_LIBCPP_HAS_THREAD_API_PTHREAD) ||                                 \
-    defined(_GLIBCXX_GCC_GTHR_POSIX_H)
-  (void)pthread_setname_np(thread.native_handle(), name.c_str());
-#else
+#ifndef __MINGW32__
+  // Not setting the thread name in MinGW environments. MinGW C++ standard
+  // libraries can either use native Windows threads or pthreads, so we
+  // don't know with certainty what kind of thread handle we're getting
+  // from thread.native_handle() here.
   typedef HRESULT(WINAPI * proc)(HANDLE, PCWSTR);
   HMODULE kbase = GetModuleHandleA("KernelBase.dll");
   proc ThreadNameProc =