[llvm] [JITLink][AArch32] Multi-stub support for armv7/thumbv7 (PR #78371)

[Stefan Gränitz via llvm-commits]

weliveindetail wrote:

This is a pretty isolated change in JITLink AArch32. Related design questions were discussed in https://github.com/llvm/llvm-project/pull/78369. It seems worth landing before release/18.x branches. If there are any questions about the code here, I am happy to discuss post-commit. Pre-merge tests had passed before rebasing.

https://github.com/llvm/llvm-project/pull/78371