Revert "Introduce rb_code_range_t and replace YYLTYPE with it"

r60655 changed the usage of bison by defining a customized YYLTYPE,
which seemed to cause a random stall at rb_thread_terminate_all.

Kazuki Tsujimoto investigated the issue and pointed out the commit that
caused it.  Thanks!

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@60660 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

node.h

@@ -227,11 +227,6 @@ typedef struct rb_code_location_struct {
     int column;
 } rb_code_location_t;
 
-typedef struct rb_code_range_struct {
-    rb_code_location_t first_loc;
-    rb_code_location_t last_loc;
-} rb_code_range_t;
-
 typedef struct RNode {
     VALUE flags;
     union {