Merge pull request #365 from rust-lang/fix/volatile-load #179

Job	Run time
duplicates	4s
build (libgccjit.so, master, --mini-tests)	11m 37s
build (libgccjit.so, master, --std-tests)	11m 59s
build (libgccjit.so, master, --test-libcore)	18m 35s
build (libgccjit.so, master, --extended-rand-tests)	15m 9s
build (libgccjit.so, master, --extended-regex-example-tests)	10m 37s
build (libgccjit.so, master, --extended-regex-tests)	18m 32s
build (libgccjit.so, master, --test-successful-rustc --nb-parts 2 --current-part 0)	19m 39s
build (libgccjit.so, master, --test-successful-rustc --nb-parts 2 --current-part 1)	19m 19s
build (libgccjit_without_int128.so, master-without-128bit-integers, --mini-tests)	12m 20s
build (libgccjit_without_int128.so, master-without-128bit-integers, --std-tests)	10m 45s
build (libgccjit_without_int128.so, master-without-128bit-integers, --test-libcore)	19m 35s
build (libgccjit_without_int128.so, master-without-128bit-integers, --extended-rand-tests)	13m 2s
build (libgccjit_without_int128.so, master-without-128bit-integers, --extended-regex-example-tests)	13m 14s
build (libgccjit_without_int128.so, master-without-128bit-integers, --extended-regex-tests)	23m 58s
build (libgccjit_without_int128.so, master-without-128bit-integers, --test-successful-rustc --nb-...	19m 46s
build (libgccjit_without_int128.so, master-without-128bit-integers, --test-successful-rustc --nb-...	24m 7s
	4h 22m 18s

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