Make Callgrind, DRD and Ptrcheck build on arm-linux.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@10985 a5019735-40e9-0310-863c-91ae7b9d1cf9
diff --git a/drd/drd_bitmap.h b/drd/drd_bitmap.h
index 55144c2..1bfde45 100644
--- a/drd/drd_bitmap.h
+++ b/drd/drd_bitmap.h
@@ -134,7 +134,7 @@
 #define BITS_PER_UWORD (8U * sizeof(UWord))
 
 /** Log2 of BITS_PER_UWORD. */
-#if defined(VGA_x86) || defined(VGA_ppc32)
+#if defined(VGA_x86) || defined(VGA_ppc32) || defined(VGA_arm)
 #define BITS_PER_BITS_PER_UWORD 5
 #elif defined(VGA_amd64) || defined(VGA_ppc64)
 #define BITS_PER_BITS_PER_UWORD 6