[LLVMdev] dmb ishld in AArch64

[Tim Northover]

> Indeed. I didn't pay too much attention to the str -> stp change.

Oh good. I can reproduce it now, on the build you were using. Still
only with Clang rather than llc, but that's just a minor
inconvenience. It should still be solvable.

> Unfortunately, the trunk build crashes when compiling the kernel. Hope it will be fixed tomorrow, else I need to find a revision that gives me this fix.

Ah, that's not so good. Still, probably better than the silently wrong
code you had to debug.

Cheers.

Tim.