merge revision(s) 1870505: [Backport #20651]

	Fix wrong unreachable chunk remove when jump destination label is unremovable

Author: k0kubun

compile.c

@@ -2975,7 +2975,6 @@ remove_unreachable_chunk(rb_iseq_t *iseq, LINK_ELEMENT *i)
                 break;
             }
             else if ((lab = find_destination((INSN *)i)) != 0) {
-                if (lab->unremovable) break;
                 unref_counts[lab->label_no]++;
             }
         }

test/ruby/test_iseq.rb

@@ -780,6 +780,11 @@ def test_unreachable_syntax_error
   end
 
   def test_unreachable_pattern_matching
+    assert_in_out_err([], "true or 1 in 1")
+    assert_in_out_err([], "true or (case 1; in 1; 1; in 2; 2; end)")
+  end
+
+  def test_unreachable_pattern_matching_in_if_condition
     assert_in_out_err([], "#{<<~"begin;"}\n#{<<~'end;'}", %w[1])
     begin;
       if true or {a: 0} in {a:}

version.h

@@ -11,7 +11,7 @@
 # define RUBY_VERSION_MINOR RUBY_API_VERSION_MINOR
 #define RUBY_VERSION_TEENY 4
 #define RUBY_RELEASE_DATE RUBY_RELEASE_YEAR_STR"-"RUBY_RELEASE_MONTH_STR"-"RUBY_RELEASE_DAY_STR
-#define RUBY_PATCHLEVEL 95
+#define RUBY_PATCHLEVEL 96
 
 #include "ruby/version.h"
 #include "ruby/internal/abi.h"