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

[Pengcheng Wang via llvm-commits]

wangpc-pp 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

It's OK as long as you have run llvm-test-suite on qemu and all tests are passed. The LLVM Github CI is not so complete for RISC-V.

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