gh-138912: Add dedicated opcodes for MatchClass without positional sub-patterns #2214

Job	Run time
x86_64-unknown-linux-gnu/gcc	9m 48s
aarch64-apple-darwin/clang	8m 12s
x86_64-apple-darwin/clang	15m 28s
x86_64-unknown-linux-gnu/gcc-free-threading	8m 19s
x86_64-pc-windows-msvc/msvc-free-threading	4m 31s
x86_64-pc-windows-msvc/msvc	10m 24s
aarch64-unknown-linux-gnu/gcc	6m 51s
	1h 3m 33s

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