Fix trim_youngest_desired for the case of high memory load and huge m…

…ain memory - the return value should never be larger than total_new_allocation.

src/coreclr/gc/gc.cpp

@@ -38191,7 +38191,8 @@ size_t gc_heap::trim_youngest_desired (uint32_t memory_load,
     }
     else
     {
-        return max (mem_one_percent, total_min_allocation);
+        size_t total_max_allocation = max (mem_one_percent, total_min_allocation);
+        return min (total_new_allocation, total_max_allocation);
     }
 }