fix page size

Signed-off-by: Schrodinger ZHU Yifan <i@zhuyi.fan>

src/snmalloc/pal/pal_linux.h

@@ -29,8 +29,9 @@ namespace snmalloc
      */
     static constexpr uint64_t pal_features = PALPOSIX::pal_features | Entropy;
 
-    static constexpr size_t page_size =
-      Aal::aal_name == PowerPC ? 0x10000 : PALPOSIX::page_size;
+    static constexpr size_t page_size = Aal::aal_name == PowerPC ?
+      0x10000 :
+      (Aal::aal_name == LoongArch ? 0x4000 : PALPOSIX::page_size);
 
     /**
      * Linux requires an explicit no-reserve flag in `mmap` to guarantee lazy