[lld] [lld][LoongArch] Relax TLSDESC code sequence (PR #123677)

[Lu Weining via llvm-commits]

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+# REQUIRES: loongarch
+# RUN: rm -rf %t && split-file %s %t && cd %t
+# RUN: llvm-mc -filetype=obj -triple=loongarch64 -mattr=+relax a.s -o a.64.o
+# RUN: llvm-mc -filetype=obj -triple=loongarch64 -mattr=+relax c.s -o c.64.o
+# RUN: ld.lld --relax -shared -soname=c.64.so c.64.o -o c.64.so
+
+## Test the TLSDESC relaxation.
+# RUN: ld.lld --relax -shared -z now a.64.o c.64.o -o a.64.so
+# RUN: llvm-readobj -r -x .got a.64.so | FileCheck --check-prefix=GD64-RELA %s
+# RUN: llvm-objdump --no-show-raw-insn -dr -h a.64.so | FileCheck %s --check-prefix=GD64
+
+## FIXME: The transition frome TLSDESC to IE/LE has not yet been implemented.
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SixWeining wrote:

```suggestion
## FIXME: The transition from TLSDESC to IE/LE has not yet been implemented.
```

https://github.com/llvm/llvm-project/pull/123677