use me->def instead of me for opt_table

	`vm_opt_method_table` is me=>bop table to manage the optimized
	methods (by specialized instruction). However, `me` can be invalidated
	to invalidate the method cache entry.
	[Bug #17725]

	To solve the issue, use `me-def` instead of `me` which simply copied
	at invalidation timing.

	A test by @jeremyevans https://github.com/ruby/ruby/pull/4376
	---
	 test/ruby/test_method.rb | 15 +++++++++++++++
	 vm.c                     | 11 +++++------
	 2 files changed, 20 insertions(+), 6 deletions(-)

	should not share same `def` for specialized method

	Because the key of redefine table is `def`, `def` should be
	unique for each optimized method (`alias` is not allowed).
	---
	 array.c | 2 +-
	 1 file changed, 1 insertion(+), 1 deletion(-)

	Guard array when appending

	This prevents early collection of the array.  The GC doesn't see the
	array on the stack when Ruby is compiled with optimizations enabled

	[ruby-core:105099] [Bug #18140]
	---
	 array.c                 | 1 +
	 test/ruby/test_array.rb | 6 ++++++
	 2 files changed, 7 insertions(+)

	Guard array when appending

	This prevents early collection of the array.  The GC doesn't see the
	array on the stack when Ruby is compiled with optimizations enabled

	Thanks @jhaberman for the test case

	[ruby-core:105099] [Bug #18140]
	---
	 ext/-test-/array/concat/depend          | 321 ++++++++++++++++++++++++++++++++
	 ext/-test-/array/concat/extconf.rb      |   2 +
	 ext/-test-/array/concat/to_ary_conact.c |  64 +++++++
	 test/-ext-/array/test_to_ary_concat.rb  |  20 ++
	 4 files changed, 407 insertions(+)
	 create mode 100644 ext/-test-/array/concat/depend
	 create mode 100644 ext/-test-/array/concat/extconf.rb
	 create mode 100644 ext/-test-/array/concat/to_ary_conact.c
	 create mode 100644 test/-ext-/array/test_to_ary_concat.rb

	Refined test [Bug #18140]

	---
	 ext/-test-/array/concat/to_ary_conact.c | 48 +++++++--------------------------
	 test/ruby/test_array.rb                 |  5 +++-
	 2 files changed, 13 insertions(+), 40 deletions(-)

	Fix length calculation for Array#slice!

	Commit 4f24255 introduced a bug which allows a length to be passed to
	rb_ary_new4 which is too large, resulting in invalid memory access.

	For example:

	    (1..1000).to_a.slice!(-2, 1000)
	---
	 array.c | 2 +-
	 1 file changed, 1 insertion(+), 1 deletion(-)

	Add out of range tests for Array#slice!

	---
	 test/ruby/test_array.rb | 13 +++++++++++++
	 1 file changed, 13 insertions(+)

	Add negative position tests [Bug #18138]

	---
	 test/ruby/test_array.rb | 4 ++++
	 1 file changed, 4 insertions(+)

	Ensure the receiver is modifiable before shrinking [Bug #17736]

	* Ensure the receiver is modifiable before shinking [Bug #17736]

	* Assert the receivers are not modified
	---
	 array.c                 |  1 +
	 test/ruby/test_array.rb | 36 ++++++++++++++++++++++++++++++++++++
	 2 files changed, 37 insertions(+)

	Some Hash destructive methods ensure the receiver modifiable [Bug
	 #17736]

	refs:

	* https://bugs.ruby-lang.org/issues/17736
	* https://github.com/ruby/ruby/pull/4296

	This commit aims to cover following methods

	* Hash#select!
	* Hash#filter!
	* Hash#keep_if
	* Hash#reject!
	* Hash#delete_if

	I think these are not all.

	---

	* Ensure the receiver is modifiable or not
	* Assert the receiver is not modified
	---
	 hash.c                 |  2 ++
	 test/ruby/test_hash.rb | 42 ++++++++++++++++++++++++++++++++++++++++++
	 2 files changed, 44 insertions(+)

	Hash#transform_values! ensures receiver modifiable in block [Bug
	 #17736]

	---
	 hash.c                 | 1 +
	 test/ruby/test_hash.rb | 9 +++++++++
	 2 files changed, 10 insertions(+)

Also document that both :deprecated and :experimental are supported
:category option values.

The locations where warnings were marked as deprecation warnings
was previously reviewed by shyouhei.

Comment a couple locations where deprecation warnings should probably
be used but are not currently used because deprecation warning
enablement has not occurred at the time they are called
(RUBY_FREE_MIN, RUBY_HEAP_MIN_SLOTS, -K).

Add assert_deprecated_warn to test assertions.  Use this to simplify
some tests, and fix failing tests after marking some warnings with
deprecated category.

Passing current ec can improve performance of newobj. This patch
tries it for Array and String literals ([] and '').

ractor_copy() used rb_ary_modify() to make sure this array is not
sharing anything, but it also checks frozen flag. So frozen arrays
raises an error. To solve this issue, this patch introduces new
function rb_ary_cancel_sharing() which makes sure the array does not
share another array and it doesn't check frozen flag.
[Bug #17343]

A test is quoted from https://github.com/ruby/ruby/pull/3817