[llvm] [RuntimeDyld][ELF][AArch64] Fix resolveAArch64ShortBranch. (PR #92245)

[Alastair Houghton via llvm-commits]

al45tair wrote:

No, it's OK, I know what the problem is now. It's a bug, and it's all over the file. It'll affect building code for 64-bit targets from 32-bit hosts in various combinations :-(

(The fundamental issue is that addresses are often regarded as signed… so before extending to 64-bit, you need to cast them to an unsigned type first. Otherwise you get sign extension, but only if the address is 32-bit to start with.)

https://github.com/llvm/llvm-project/pull/92245