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

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `ml-opt-rel-x86-64` running on `ml-opt-rel-x86-64-b1` while building `llvm` at step 6 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/185/builds/9183

<details>
<summary>Here is the relevant piece of the build log for the reference</summary>

```
Step 6 (test-build-unified-tree-check-all) failure: test (failure)
******************** TEST 'LLVM :: CodeGen/RISCV/compress-opt-select.ll' FAILED ********************
Exit Code: 1

Command Output (stderr):
--
RUN: at line 2: /b/ml-opt-rel-x86-64-b1/build/bin/llc -mtriple=riscv32 -target-abi ilp32d -mattr=+c,+f,+d      -riscv-no-aliases < /b/ml-opt-rel-x86-64-b1/llvm-project/llvm/test/CodeGen/RISCV/compress-opt-select.ll    | /b/ml-opt-rel-x86-64-b1/build/bin/FileCheck -check-prefix=RV32IFDC /b/ml-opt-rel-x86-64-b1/llvm-project/llvm/test/CodeGen/RISCV/compress-opt-select.ll
+ /b/ml-opt-rel-x86-64-b1/build/bin/FileCheck -check-prefix=RV32IFDC /b/ml-opt-rel-x86-64-b1/llvm-project/llvm/test/CodeGen/RISCV/compress-opt-select.ll
+ /b/ml-opt-rel-x86-64-b1/build/bin/llc -mtriple=riscv32 -target-abi ilp32d -mattr=+c,+f,+d -riscv-no-aliases
/b/ml-opt-rel-x86-64-b1/llvm-project/llvm/test/CodeGen/RISCV/compress-opt-select.ll:16:18: error: RV32IFDC-NEXT: expected string not found in input
; RV32IFDC-NEXT: addi a0, zero, 42
                 ^
<stdin>:13:9: note: scanning from here
# %bb.1:
        ^
<stdin>:18:13: note: possible intended match here
 .size ne_small_pos, .Lfunc_end0-ne_small_pos
            ^
/b/ml-opt-rel-x86-64-b1/llvm-project/llvm/test/CodeGen/RISCV/compress-opt-select.ll:44:18: error: RV32IFDC-NEXT: expected string not found in input
; RV32IFDC-NEXT: addi a0, zero, 42
                 ^
<stdin>:29:9: note: scanning from here
# %bb.1:
        ^
<stdin>:34:8: note: possible intended match here
 .size ne_small_neg, .Lfunc_end1-ne_small_neg
       ^
/b/ml-opt-rel-x86-64-b1/llvm-project/llvm/test/CodeGen/RISCV/compress-opt-select.ll:72:18: error: RV32IFDC-NEXT: expected string not found in input
; RV32IFDC-NEXT: addi a0, zero, 42
                 ^
<stdin>:45:9: note: scanning from here
# %bb.1:
        ^
<stdin>:51:2: note: possible intended match here
 .cfi_endproc
 ^
/b/ml-opt-rel-x86-64-b1/llvm-project/llvm/test/CodeGen/RISCV/compress-opt-select.ll:100:18: error: RV32IFDC-NEXT: expected string not found in input
; RV32IFDC-NEXT: addi a0, zero, 42
                 ^
<stdin>:61:9: note: scanning from here
# %bb.1:
        ^
<stdin>:66:12: note: possible intended match here
 .size ne_small_edge_neg, .Lfunc_end3-ne_small_edge_neg
           ^
/b/ml-opt-rel-x86-64-b1/llvm-project/llvm/test/CodeGen/RISCV/compress-opt-select.ll:129:18: error: RV32IFDC-NEXT: expected string not found in input
; RV32IFDC-NEXT: addi a0, zero, 42
                 ^
<stdin>:77:9: note: scanning from here
# %bb.1:
        ^
...

```

</details>

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