util: modify Win32LockedPageAllocator to query windows for limit

src/support/lockedpool.cpp

@@ -202,7 +202,10 @@ void Win32LockedPageAllocator::FreeLocked(void* addr, size_t len)
 
 size_t Win32LockedPageAllocator::GetLimit()
 {
-    // TODO is there a limit on Windows, how to get it?
+    size_t min, max;
+    if(GetProcessWorkingSetSize(GetCurrentProcess(), &min, &max) != 0) {
+        return min;
+    }
     return std::numeric_limits<size_t>::max();
 }
 #endif