__on_dlclose should be aligned

Marking segments read-only was pushing the alignment of __on_dlclose by
2 bytes making it unaligned. This change makes sure the ARM code is
aligned to the 4 byte boundary.

Bug: 6313309
Change-Id: Ic2bf475e120dd61225ec19e5d8a9a8b1d0b7f081
diff --git a/libc/arch-arm/bionic/crtbegin_so.S b/libc/arch-arm/bionic/crtbegin_so.S
index 9275b1e..a54ed0d 100644
--- a/libc/arch-arm/bionic/crtbegin_so.S
+++ b/libc/arch-arm/bionic/crtbegin_so.S
@@ -26,6 +26,10 @@
  * SUCH DAMAGE.
  */
 
+#include <machine/asm.h>
+
+ENTRY(__on_dlclose)
+
 # Implement static C++ destructors when the shared
 # library is unloaded through dlclose().
 #
@@ -52,6 +56,8 @@
         .long -1
         .long __on_dlclose
 
+END(__on_dlclose)
+
 #ifdef CRT_LEGACY_WORKAROUND
 #include "__dso_handle.S"
 #else