[llvm] [RISCV] Implement tail call optimization in machine outliner (PR #115297)

[Mark Goncharov via llvm-commits]

mga-sc wrote:

> LGTM in general, but I'd like to know if we have passed all tests in llvm-test-suite with `-Oz`.

@wangpc-pp , llvm-test-suite with `-Oz` locally has been passed. I don't know how to run it using this git infrastructure

https://github.com/llvm/llvm-project/pull/115297