Move common macros into bionic_macros.h.

Bug: 15590152
Change-Id: I730636613ef3653f68c5ab1d43b53beaf8e0dc25
diff --git a/libc/private/bionic_tls.h b/libc/private/bionic_tls.h
index b52013f..56a61be 100644
--- a/libc/private/bionic_tls.h
+++ b/libc/private/bionic_tls.h
@@ -31,6 +31,7 @@
 
 #include <sys/cdefs.h>
 #include <sys/limits.h>
+#include "bionic_macros.h"
 #include "__get_tls.h"
 
 __BEGIN_DECLS
@@ -84,8 +85,6 @@
 #define BIONIC_TLS_RESERVED_SLOTS GLOBAL_INIT_THREAD_LOCAL_BUFFER_COUNT
 #endif
 
-#define BIONIC_ALIGN(x, a) (((x) + (a - 1)) & ~(a - 1))
-
 /*
  * Maximum number of elements in the TLS array.
  * This includes space for pthread keys and our own internal slots.