src: cache continuation_data pointer in MKDirpSync #6784

Job	Run time
Build slim tarball	1m 16s
x86_64-darwin: with shared libraries	38m 42s
aarch64-linux: Cache V8 build	25s
x86_64-linux: with shared libraries	28m 37s
aarch64-darwin: with shared libraries	23m 12s
aarch64-linux: with shared openssl-1.1.1w	24m 10s
aarch64-linux: with shared openssl-4.0.0	23m 43s
aarch64-linux: with shared openssl-3.0.19	23m 39s
aarch64-linux: with shared openssl-3.5.5	24m 7s
aarch64-linux: with shared openssl-3.6.1	23m 47s
aarch64-linux: with shared boringssl-0.20260413.0	23m 46s
	3h 55m 24s

Provide feedback