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Packing the buffer into itself is not possible #770

Job	Run time
ruby-bench (--warmup=1 --bench=1 --excludes=shipit)	14m 20s
make (check, cppflags=-DVM_CHECK_MODE)	9m 9s
make (test-bundled-gems)	12m 54s
make (test-bundler-parallel, 50)	20m 17s
make (check, --enable-shared --enable-load-relative)	7m 23s
make (check, i686)	11m 20s
make (check, ubuntu-24.04, capi)	9m 38s
make (check, --disable-yjit)	7m 20s
make-ibm	-1s
Ubuntu result	4s
	1h 32m 24s