This reverts commit acb19e8707093593e967b6af03d92da5c570ffc6.

	Fix memory leak in Prism's RubyVM::InstructionSequence.new

	[Bug #21394]

	There are two ways to make RubyVM::InstructionSequence.new raise which
	would cause the options->scopes to leak memory:

	1. Passing in any (non T_FILE) object where the to_str raises.
	2. Passing in a T_FILE object where String#initialize_dup raises. This is
	   because rb_io_path dups the string.

	Example 1:

	    10.times do
	      100_000.times do
	        RubyVM::InstructionSequence.new(nil)
	      rescue TypeError
	      end

	      puts `ps -o rss= -p #{$$}`
	    end

	Before:

	    13392
	    17104
	    20256
	    23920
	    27264
	    30432
	    33584
	    36752
	    40032
	    43232

	After:

	    9392
	    11072
	    11648
	    11648
	    11648
	    11712
	    11712
	    11712
	    11744
	    11744

	Example 2:

	    require "tempfile"

	    MyError = Class.new(StandardError)
	    String.prepend(Module.new do
	      def initialize_dup(_)
	        if $raise_on_dup
	          raise MyError
	        else
	          super
	        end
	      end
	    end)

	    Tempfile.create do |f|
	      10.times do
	        100_000.times do
	          $raise_on_dup = true
	          RubyVM::InstructionSequence.new(f)
	        rescue MyError
	        else
	          raise "MyError was not raised during RubyVM::InstructionSequence.new"
	        end

	        puts `ps -o rss= -p #{$$}`
	      ensure
	        $raise_on_dup = false
	      end
	    end

	Before:

	    14080
	    18512
	    22000
	    25184
	    28320
	    31600
	    34736
	    37904
	    41088
	    44256

	After:

	    12016
	    12464
	    12880
	    12880
	    12880
	    12912
	    12912
	    12912
	    12912
	    12912

	compile.c: Handle anonymous variables in `outer_variable_cmp`

	[Bug #21370]

Previously, live range of `ast_value` ended on the call right before
rb_ast_dispose(), which led to premature collection and use-after-free.

We observed this crashing on -O3, -DVM_CHECK_MODE, with GCC 11.4.0 on
Ubuntu.

Co-authored-by: Aaron Patterson <tenderlove@ruby-lang.org>

This would be useful for debugging.

Related: ruby/prism#2935

[Bug #20344]
Fix compile_next adding removable adjust label