Compile PHAR

Simplify property memoization for Flyweight pattern by replacing it with `??=` #20376

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Job	Run time
Compiler Tests	24s
integration-tests	0s
Download base SHA PHAR	1s
Checksum PHAR	1s
extension-tests	0s
Commit PHAR	1s
other-tests	0s
PHAR Prefix Diff	1s
	28s