parse.y: Remove almost all *_gen macros by passing parser_params explicitly

In parse.y many functions were suffixed "_gen" and had companion macros
to pass struct parser_params implicitly, which made parse.c bigger and
more obscure.

This change expands and removes almost all "*_gen" macros.  This
requires explicit passing of struct parser_params, i.e., we need to
write "foo(p, ..)" instead of "foo(..)".  However, it is just extra
three letters.  I believe that this is easier to understand.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@61818 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

node.h

@@ -373,7 +373,7 @@ typedef struct RNode {
 
 #define NEW_DEFN(i,a,d,loc) NEW_NODE(NODE_DEFN,0,i,NEW_SCOPE(a,d,loc),loc)
 #define NEW_DEFS(r,i,a,d,loc) NEW_NODE(NODE_DEFS,r,i,NEW_SCOPE(a,d,loc),loc)
-#define NEW_SCOPE(a,b,loc) NEW_NODE(NODE_SCOPE,local_tbl(),b,a,loc)
+#define NEW_SCOPE(a,b,loc) NEW_NODE(NODE_SCOPE,local_tbl(p),b,a,loc)
 #define NEW_BLOCK(a,loc) NEW_NODE(NODE_BLOCK,a,0,0,loc)
 #define NEW_IF(c,t,e,loc) NEW_NODE(NODE_IF,c,t,e,loc)
 #define NEW_UNLESS(c,t,e,loc) NEW_NODE(NODE_UNLESS,c,t,e,loc)