merge revision(s) 0700d0fd,62c2082f: [Backport #19469]

	Fix indentation in vm_setivar_default

	---
	 vm_insnhelper.c | 6 +++---
	 1 file changed, 3 insertions(+), 3 deletions(-)

	[Bug #19469] Fix crash when resizing generic iv list

	The following script can sometimes trigger a crash:

	```ruby
	GC.stress = true

	class Array
	  def foo(bool)
	    if bool
	      @a = 1
	      @b = 2
	      @c = 1
	    else
	      @c = 1
	    end
	  end
	end

	obj = []
	obj.foo(true)

	obj2 = []
	obj2.foo(false)

	obj3 = []
	obj3.foo(true)
	```

	This is because vm_setivar_default calls rb_ensure_generic_iv_list_size
	to resize the iv list. However, the call to gen_ivtbl_resize reallocs
	the iv list, and then inserts into the generic iv table. If the
	st_insert triggers a GC then the old iv list will be read during
	marking, causing a use-after-free bug.

Co-Authored-By: Jemma Issroff <jemmaissroff@gmail.com>
	---
	 internal/variable.h |  2 +-
	 variable.c          | 23 ++++++++++++++++++-----
	 vm_insnhelper.c     |  4 ++--
	 3 files changed, 21 insertions(+), 8 deletions(-)