WIP: Fix for m68k #1482

Job	Run time
duplicates	3s
build (libgccjit.so, master, --mini-tests)	10m 54s
build (libgccjit.so, master, --std-tests)	9m 35s
build (libgccjit.so, master, --test-libcore)	10m 31s
build (libgccjit.so, master, --extended-rand-tests)	12m 29s
build (libgccjit.so, master, --extended-regex-example-tests)	9m 54s
build (libgccjit.so, master, --extended-regex-tests)	17m 36s
build (libgccjit.so, master, --test-successful-rustc --nb-parts 2 --current-part 0)	19m 27s
build (libgccjit.so, master, --test-successful-rustc --nb-parts 2 --current-part 1)	19m 0s
build (libgccjit_without_int128.so, master-without-128bit-integers, --mini-tests)	9m 14s
build (libgccjit_without_int128.so, master-without-128bit-integers, --std-tests)	11m 45s
build (libgccjit_without_int128.so, master-without-128bit-integers, --test-libcore)	11m 13s
build (libgccjit_without_int128.so, master-without-128bit-integers, --extended-rand-tests)	11m 20s
build (libgccjit_without_int128.so, master-without-128bit-integers, --extended-regex-example-tests)	10m 39s
build (libgccjit_without_int128.so, master-without-128bit-integers, --extended-regex-tests)	20m 42s
build (libgccjit_without_int128.so, master-without-128bit-integers, --test-successful-rustc --nb-...	19m 6s
build (libgccjit_without_int128.so, master-without-128bit-integers, --test-successful-rustc --nb-...	18m 54s
	3h 42m 22s

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