add virtual address bits and physical memory to the mem config

include/mimalloc/prim.h

@@ -25,6 +25,8 @@ typedef struct mi_os_mem_config_s {
   size_t  page_size;            // default to 4KiB
   size_t  large_page_size;      // 0 if not supported, usually 2MiB (4MiB on Windows)
   size_t  alloc_granularity;    // smallest allocation size (usually 4KiB, on Windows 64KiB)
+  size_t  physical_memory;      // physical memory size
+  size_t  virtual_address_bits; // usually 48 or 56 bits on 64-bit systems. (used to determine secure randomization)
   bool    has_overcommit;       // can we reserve more memory than can be actually committed?
   bool    has_partial_free;     // can allocated blocks be freed partially? (true for mmap, false for VirtualAlloc)
   bool    has_virtual_reserve;  // supports virtual address space reservation? (if true we can reserve virtual address space without using commit or physical memory)