[PATCH] D23930: [AArch64] Fix encoding for lsl #12 in add/sub immediates

[Tim Northover via llvm-commits]

t.p.northover added a comment.

Seems basically reasonable. It would probably be better if we diagnosed attempts that ended up with a relocation (as far as I can see there's no good reason to write those forms). But since we don't do that now, it probably needn't be in this patch.


https://reviews.llvm.org/D23930