Use NODE_CASE2 if case expressions don't exist

When NODE_WHEN is compiled by iseq_compile_each0,
the node passed to compile_when is NODE_WHEN (not NODE_CASE).
So we can not handle the location of NODE_CASE of
case statements which don't have case expressions.

e.g. :

```
case; when 1; foo; when 2; bar; else baz; end
```

This commit adds NODE_CASE2, and compiles it by
iseq_compile_each0.

* compile.c (compile_case): Does not call COMPILE_ when
  NODE_CASE does not have case expressions.
* compile.c (compile_case2): Compile NODE_CASE2 by compile_case2.
* compile.c (compile_when): Delete an obsoleted function.
* compile.c (iseq_compile_each0): Compile NODE_CASE2.

* ext/objspace/objspace.c (count_nodes): Add NODE_CASE2 case.

* node.c (dump_node, rb_gc_mark_node): Add NODE_CASE2 case.

* node.h (node_type): Add NODE_CASE2.
* node.h (NEW_CASE2): Add a macro which generates NODE_CASE2.

* parse.y: Generate NODE_CASE2 if case expressions don't exist.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@60585 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 1 deletions

diff --git a/parse.y b/parse.y
index d83586cf57..3607b5c39c 100644
--- a/parse.y
+++ b/parse.y
@@ -2866,7 +2866,7 @@ primary		: literal
 		| k_case opt_terms case_body k_end
 		    {
 		    /*%%%*/
-			$$ = NEW_CASE(0, $3);
+			$$ = NEW_CASE2(0, $3);
 			nd_set_line($3, $<num>1);
 			nd_set_lineno($$, @1.first_line);
 			nd_set_column($$, @1.first_column);