json: Store short arrays in-place. #3282

Job	Run time
libreswan (ubuntu-24.04)	9s
dpdk gcc (ubuntu-24.04)	5s
linux deb no dpdk	5m 12s
build oss-fuzz fuzzers	2m 55s
osx clang --disable-ssl	1m 35s
linux rpm fedora	4m 3s
clang-analyze-cache	11m 48s
linux gcc --disable-ssl	2m 58s
linux clang --disable-ssl	2m 52s
linux gcc c99	2m 40s
linux clang c99	2m 39s
linux gcc test	8m 40s
linux clang address,undefined test	16m 34s
linux gcc test --enable-shared	11m 48s
linux clang test --enable-shared	11m 9s
linux gcc check check-dpdk dpdk	20m 22s
linux clang check check-dpdk dpdk	19m 54s
linux gcc test -ljemalloc	8m 59s
linux clang test -ljemalloc	9m 11s
linux gcc --enable-afxdp	2m 35s
linux clang --enable-afxdp	2m 33s
linux gcc dpdk --enable-shared	4m 1s
linux clang dpdk --enable-shared	3m 42s
linux gcc dpdk-shared	2m 53s
linux clang dpdk-shared	2m 53s
linux gcc dpdk-shared --enable-shared	4m 2s
linux clang dpdk-shared --enable-shared	4m 6s
linux gcc m32 --disable-ssl	2m 36s
linux gcc check-ovsdb-cluster	6m 32s
linux gcc check-kernel -100	10m 45s
linux gcc check-kernel 100-	17m 19s
linux clang address,undefined check-kernel -100	13m 19s
linux clang address,undefined check-kernel 100-	19m 57s
linux gcc check-offloads -100	9m 44s
linux gcc check-offloads 100-	12m 5s
linux gcc dpdk check-system-userspace	13m 41s
linux clang address,undefined dpdk check-system-userspace	15m 52s
linux gcc dpdk check-system-tso	12m 29s
linux gcc dpdk check-afxdp	13m 6s
clang-analyze	10m 59s
	5h 28m 42s

Provide feedback