Fix #4263

Author: matyhtf

include/swoole_memory.h

@@ -22,6 +22,8 @@
 //-------------------memory manager-------------------------
 namespace swoole {
 
+#pragma pack(8)
+
 class MemoryPool {
   public:
     virtual ~MemoryPool(){};

src/memory/global_memory.cc

@@ -39,6 +39,7 @@ struct GlobalMemoryImpl {
 
 struct MemoryBlock {
     uint32_t size;
+    uint32_t reserved;
     char memory[0];
 };