[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-linux` running on `premerge-linux-1` while building `lld` at step 7 "test-build-unified-tree-check-all".

Full details are available at: https://lab.llvm.org/buildbot/#/builders/153/builds/25151

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

```
Step 7 (test-build-unified-tree-check-all) failure: test (failure)
******************** TEST 'lld :: ELF/loongarch-relax-call36-2.s' FAILED ********************
Exit Code: 1

Command Output (stderr):
--
RUN: at line 4: rm -rf /build/buildbot/premerge-monolithic-linux/build/tools/lld/test/ELF/Output/loongarch-relax-call36-2.s.tmp && split-file /build/buildbot/premerge-monolithic-linux/llvm-project/lld/test/ELF/loongarch-relax-call36-2.s /build/buildbot/premerge-monolithic-linux/build/tools/lld/test/ELF/Output/loongarch-relax-call36-2.s.tmp && cd /build/buildbot/premerge-monolithic-linux/build/tools/lld/test/ELF/Output/loongarch-relax-call36-2.s.tmp
+ rm -rf /build/buildbot/premerge-monolithic-linux/build/tools/lld/test/ELF/Output/loongarch-relax-call36-2.s.tmp
+ split-file /build/buildbot/premerge-monolithic-linux/llvm-project/lld/test/ELF/loongarch-relax-call36-2.s /build/buildbot/premerge-monolithic-linux/build/tools/lld/test/ELF/Output/loongarch-relax-call36-2.s.tmp
+ cd /build/buildbot/premerge-monolithic-linux/build/tools/lld/test/ELF/Output/loongarch-relax-call36-2.s.tmp
RUN: at line 5: /build/buildbot/premerge-monolithic-linux/build/bin/llvm-mc -filetype=obj -triple=loongarch64 -mattr=+relax a.s -o a.o
+ /build/buildbot/premerge-monolithic-linux/build/bin/llvm-mc -filetype=obj -triple=loongarch64 -mattr=+relax a.s -o a.o
a.s:10:16: error: invalid variant 'plt'
  call36 ifunc at plt      # enable ifunc, not relaxed
               ^
a.s:11:21: error: invalid variant 'plt'
  tail36 $t0, ifunc at plt # enable ifunc, not relaxed
                    ^

--

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


```

</details>

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