src: cache continuation_data pointer in MKDirpSync #6752

Job	Run time
Build slim tarball	1m 8s
aarch64-linux: Cache V8 build	25s
x86_64-linux: with shared libraries	7m 50s
aarch64-darwin: with shared libraries	7m 55s
x86_64-darwin: with shared libraries	8m 7s
aarch64-linux: with shared openssl-1.1.1w	6m 58s
aarch64-linux: with shared openssl-4.0.0	6m 58s
aarch64-linux: with shared openssl-3.5.5	7m 0s
aarch64-linux: with shared boringssl-0.20260413.0	6m 57s
aarch64-linux: with shared openssl-3.0.19	6m 57s
aarch64-linux: with shared openssl-3.6.1	6m 57s
	1h 7m 12s

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