Fix formatting of comment

From-SVN: r34293

gcc/basic-block.h

@@ -165,7 +165,8 @@ typedef struct basic_block_def {
   /* The active eh region before head and after end.  */
   int eh_beg, eh_end;
 
-  int count;		/* Expected number of executions calculated in profile.c  */
+  int count;		/* Expected number of executions: calculated in
+                           profile.c */
 } *basic_block;
 
 /* Number of basic blocks in the current function.  */