Move OS_PAGE_SIZE to PAL

src/mem/allocconfig.h

@@ -92,18 +92,7 @@ namespace snmalloc
   // Used to isolate values on cache lines to prevent false sharing.
   static constexpr size_t CACHELINE_SIZE = 64;
 
-  // Used to keep Superslab metadata committed.
-  static constexpr size_t OS_PAGE_SIZE = 0x1000;
   static constexpr size_t PAGE_ALIGNED_SIZE = OS_PAGE_SIZE << INTERMEDIATE_BITS;
-  // Some system headers (e.g. Linux' sys/user.h, FreeBSD's machine/param.h)
-  // define `PAGE_SIZE` as a macro.  We don't use `PAGE_SIZE` as our variable
-  // name, to avoid conflicts, but if we do see a macro definition then check
-  // that our value matches the platform's expected value.
-#ifdef PAGE_SIZE
-  static_assert(
-    PAGE_SIZE == OS_PAGE_SIZE,
-    "Page size from system header does not match snmalloc config page size.");
-#endif
 
   // Minimum allocation size is space for two pointers.
   static_assert(bits::next_pow2_const(sizeof(void*)) == sizeof(void*));

src/mem/sizeclass.h

@@ -1,6 +1,6 @@
 #pragma once
 
-#include "../pal/pal_consts.h"
+#include "../pal/pal.h"
 #include "allocconfig.h"
 
 namespace snmalloc