merge revision(s) 0d89aedb,a6f5f3cc,97cf2900: [Backport #17338]

	Assign TAG_NONE to ruby_tag_type instead of 0

	---
	 eval.c | 4 ++--
	 1 file changed, 2 insertions(+), 2 deletions(-)

	Also `eclass` loop can raise in `rb_obj_is_kind_of`

	---
	 eval.c | 2 +-
	 1 file changed, 1 insertion(+), 1 deletion(-)

	Copy va_list of exception classes

	The list is reused when an exception raised again after retrying
	in the rescue procedure.
	---
	 eval.c | 6 +++++-
	 1 file changed, 5 insertions(+), 1 deletion(-)