Enlarge stack overflow handling helper stack (#110068)

The stack overflow coreclr tests started to fail recently. It turns out that
was caused by the size of the helper stack allocated for stack overflow
handling case is no longer sufficient. Moreover, there is a bug in
`Thread::CreateUtilityThread` that calls the `SetThreadName` even when the
thread creation fails.

Close #109499

src/coreclr/pal/src/exception/signal.cpp

@@ -206,7 +206,7 @@ BOOL SEHInitializeSignals(CorUnix::CPalThread *pthrCurrent, DWORD flags)
         }
 
         // Allocate the minimal stack necessary for handling stack overflow
-        int stackOverflowStackSize = ALIGN_UP(sizeof(SignalHandlerWorkerReturnPoint), 16) + 7 * 4096;
+        int stackOverflowStackSize = ALIGN_UP(sizeof(SignalHandlerWorkerReturnPoint), 16) + 8 * 4096;
         // Align the size to virtual page size and add one virtual page as a stack guard
         stackOverflowStackSize = ALIGN_UP(stackOverflowStackSize, GetVirtualPageSize()) + GetVirtualPageSize();
         int flags = MAP_ANONYMOUS | MAP_PRIVATE;

src/coreclr/vm/threads.cpp

@@ -2015,10 +2015,13 @@ HANDLE Thread::CreateUtilityThread(Thread::StackSizeBucket stackSizeBucket, LPTH
     DWORD threadId;
     HANDLE hThread = CreateThread(NULL, stackSize, start, args, flags, &threadId);
 
-    SetThreadName(hThread, pName);
+    if (hThread != INVALID_HANDLE_VALUE)
+    {
+        SetThreadName(hThread, pName);
 
-    if (pThreadId)
-        *pThreadId = threadId;
+        if (pThreadId)
+            *pThreadId = threadId;
+    }
 
     return hThread;
 }