[lld] [lld][LoongArch] Relax call36/tail36: R_LARCH_CALL36 (PR #123576)

[LLVM Continuous Integration via llvm-commits]

llvm-ci wrote:

LLVM Buildbot has detected a new failure on builder `premerge-monolithic-windows` running on `premerge-windows-1` while building `lld` at step 8 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/35/builds/8004

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

```
Step 8 (test-build-unified-tree-check-all) failure: test (failure)
******************** TEST 'lld :: ELF/loongarch-relax-call36.s' FAILED ********************
Exit Code: 1

Command Output (stdout):
--
# RUN: at line 4
rm -rf C:\ws\buildbot\premerge-monolithic-windows\build\tools\lld\test\ELF\Output\loongarch-relax-call36.s.tmp && split-file C:\ws\buildbot\premerge-monolithic-windows\llvm-project\lld\test\ELF\loongarch-relax-call36.s C:\ws\buildbot\premerge-monolithic-windows\build\tools\lld\test\ELF\Output\loongarch-relax-call36.s.tmp && cd C:\ws\buildbot\premerge-monolithic-windows\build\tools\lld\test\ELF\Output\loongarch-relax-call36.s.tmp
# executed command: rm -rf 'C:\ws\buildbot\premerge-monolithic-windows\build\tools\lld\test\ELF\Output\loongarch-relax-call36.s.tmp'
# executed command: split-file 'C:\ws\buildbot\premerge-monolithic-windows\llvm-project\lld\test\ELF\loongarch-relax-call36.s' 'C:\ws\buildbot\premerge-monolithic-windows\build\tools\lld\test\ELF\Output\loongarch-relax-call36.s.tmp'
# executed command: cd 'C:\ws\buildbot\premerge-monolithic-windows\build\tools\lld\test\ELF\Output\loongarch-relax-call36.s.tmp'
# RUN: at line 6
c:\ws\buildbot\premerge-monolithic-windows\build\bin\llvm-mc.exe -filetype=obj -triple=loongarch64 -mattr=+relax a.s -o a.64.o
# executed command: 'c:\ws\buildbot\premerge-monolithic-windows\build\bin\llvm-mc.exe' -filetype=obj -triple=loongarch64 -mattr=+relax a.s -o a.64.o
# .---command stderr------------
# | a.s:4:17: error: invalid variant 'plt'
# |   tail36 $t0, a at plt # relaxed. la64: b
# |                 ^
# | a.s:15:17: error: invalid variant 'plt'
# |   call36 _start at plt         # relaxed. la64: bl
# |                 ^
# | a.s:16:22: error: invalid variant 'plt'
# |   tail36 $t0, _start at plt    # relaxed. la64: b
# |                      ^
# | a.s:19:17: error: invalid variant 'plt'
# |   call36 _start at plt         # relaxed. la64: bl
# |                 ^
# | a.s:20:22: error: invalid variant 'plt'
# |   tail36 $t0, _start at plt    # relaxed. la64: b
# |                      ^
# | a.s:23:17: error: invalid variant 'plt'
# |   call36 _start at plt         # exceed range, not relaxed
# |                 ^
# | a.s:24:21: error: invalid variant 'plt'
# |   tail36 $t0,_start at plt     # exceed range, not relaxed
# |                     ^
# `-----------------------------
# error: command failed with exit status: 1

--

********************


```

</details>

https://github.com/llvm/llvm-project/pull/123576