Cache matchers from pattern args #241

Job	Run time
coverage	19s
build	6s
leftovers	8s
compare (rails/rails, ubuntu)	9s
compare (rails/rails, windows)	2m 41s
rspec (2.7, ubuntu)	42s
rubocop	13s
compare (rails/rails, macos)	45s
spellr	10s
rspec (2.7, windows)	2m 19s
compare (ruby/ruby, ubuntu)	30s
rspec (2.7, macos)	1m 32s
compare (ruby/ruby, windows)	2m 5s
rspec (3.0, ubuntu)	16s
compare (ruby/ruby, macos)	1m 5s
rspec (3.0, windows)	1m 25s
compare (facebook/react, ubuntu)	12s
rspec (3.0, macos)	27s
compare (facebook/react, windows)	2m 30s
rspec (3.1, ubuntu)	21s
compare (facebook/react, macos)	29s
rspec (3.1, windows)	1m 40s
rspec (3.1, macos)	38s
rspec (3.2, ubuntu)	19s
rspec (3.2, windows)	3m 6s
rspec (3.2, macos)	31s
rspec (ruby-head, ubuntu)	14s
rspec (ruby-head, windows)	1m 30s
rspec (ruby-head, macos)	28s
rspec (jruby-9.4, ubuntu)	1m 19s
rspec (jruby-9.4, windows)	3m 24s
rspec (jruby-9.4, macos)	2m 48s
rspec (jruby-head, ubuntu)	1m 14s
rspec (jruby-head, windows)	3m 11s
rspec (jruby-head, macos)	3m 25s
	42m 11s

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