src: cache continuation_data pointer in MKDirpSync #6754

Job	Run time
Build slim tarball	1m 12s
aarch64-linux: Cache V8 build	22s
x86_64-darwin: with shared libraries	42m 4s
aarch64-darwin: with shared libraries	24m 15s
x86_64-linux: with shared libraries	25m 36s
aarch64-linux: with shared openssl-3.5.5	22m 26s
aarch64-linux: with shared openssl-3.6.1	21m 38s
aarch64-linux: with shared openssl-1.1.1w	22m 15s
aarch64-linux: with shared boringssl-0.20260413.0	22m 33s
aarch64-linux: with shared openssl-4.0.0	21m 22s
aarch64-linux: with shared openssl-3.0.19	22m 15s
	3h 45m 58s

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