[llvm] [RISCV][Disassemble] Ensure the comment stream of the disassembler is set. (PR #125962)

[via llvm-commits]

tedwoodward wrote:

> Is Hexagon just getting lucky that the null comment stream was never written to by the Symbolizer which would cause segmentation fault.

I'm not sure. I haven't worked in the guts of the disassembler in many years!

It looks like we pushed up a change to add CommentStream to the Hexagon disassembler; thanks @quic-areg !

https://github.com/llvm/llvm-project/pull/125962