[compiler-rt] [win/asan] GetInstructionSize: Support `48 bX` movabsq instructions. (PR #141625)

[via llvm-commits]

bernhardu wrote:

> lgtm
> 
> Do you need me to press the merge button?

Thanks for having a look, yes, if you could press the button would be great.

https://github.com/llvm/llvm-project/pull/141625