Fix volatile loads and stores #2311

Job	Run time
build_system	23s
build (gcc-13.deb, --mini-tests)	6m 4s
duplicates	2s
build (gcc-13.deb, --std-tests)	6m 24s
build (gcc-13.deb, --test-libcore)	13m 26s
build (gcc-13.deb, --extended-rand-tests)	8m 50s
build (gcc-13.deb, --extended-regex-example-tests)	6m 55s
build (gcc-13.deb, --extended-regex-tests)	12m 21s
build (gcc-13.deb, --test-successful-rustc --nb-parts 2 --current-part 0)	16m 33s
build (gcc-13.deb, --test-successful-rustc --nb-parts 2 --current-part 1)	16m 49s
build (gcc-13.deb, --projects)	16m 35s
build (gcc-13-without-int128.deb, --mini-tests)	6m 16s
build (gcc-13-without-int128.deb, --std-tests)	6m 40s
build (gcc-13-without-int128.deb, --test-libcore)	13m 37s
build (gcc-13-without-int128.deb, --extended-rand-tests)	9m 39s
build (gcc-13-without-int128.deb, --extended-regex-example-tests)	6m 46s
build (gcc-13-without-int128.deb, --extended-regex-tests)	12m 28s
build (gcc-13-without-int128.deb, --test-successful-rustc --nb-parts 2 --current-part 0)	16m 53s
build (gcc-13-without-int128.deb, --test-successful-rustc --nb-parts 2 --current-part 1)	17m 6s
build (gcc-13-without-int128.deb, --projects)	17m 11s
	3h 30m 58s

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