[llvm] [feature][riscv] handle target address calculation in llvm-objdump disassembly for riscv (PR #144620)

[Fangrui Song via llvm-commits]

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MaskRay wrote:

We try hard not to introduce precanned binaries for testing. They are opaque, difficult to update, and typically increase the repo size more than text files.

If you want to test an executable, linked by lld, there is a recent example at 
`cross-project-tests/tools/llvm-objdump/ARM/`

https://github.com/llvm/llvm-project/pull/144620