Drop dead (private) methods from BaseMatcher #809

Job	Run time
Rubocop	23s
Ruby 2.7 (Windows)	4m 38s
Ruby 3.3	2m 30s
Ruby 2.6 (Windows)	3m 54s
Legacy Ruby Builds (2.1.9)	1m 22s
Ruby 3.2	2m 10s
Ruby 2.5 (Windows)	3m 22s
Legacy Ruby Builds (2.0)	1m 12s
Ruby 2.4 (Windows)	4m 3s
Legacy Ruby Builds (1.9.3)	1m 14s
Ruby 3.1	2m 19s
Ruby 2.3 (Windows)	3m 49s
Legacy Ruby Builds (1.9.2)	1m 44s
Ruby 3.0	2m 27s
Ruby 2.2 (Windows)	3m 19s
Legacy Ruby Builds (1.8.7)	1m 15s
Ruby 2.7	3m 45s
Legacy Ruby Builds (REE)	1m 20s
Ruby 2.6	3m 39s
Legacy Ruby Builds (JRuby 1.7)	4m 7s
Ruby 2.5	3m 51s
Legacy Ruby Builds (JRuby 1.7 1.8 mode)	3m 35s
Ruby 2.4	2m 27s
Legacy Ruby Builds (JRuby 9.1.17.0)	4m 50s
Ruby 2.3	2m 16s
Ruby 2.2	2m 44s
Ruby ruby-head	31s
Ruby jruby-9.2.13.0	7m 0s
Ruby 2.7 with diff-lcs 1.3	3m 45s
Ruby 2.7 with diff-lcs 1.4.3	3m 43s
	1h 27m 14s

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