"libomptarget :: x86_64-pc-linux-gnu :: offloading/bug51781.c" fails without -DCLANG_DEFAULT_LINKER=lld

[jdenny-ornl]

I am building LLVM main at 50835f0. The following tests fail for me:

Failed Tests (2):
  libomptarget :: x86_64-pc-linux-gnu :: offloading/bug51781.c
  libomptarget :: x86_64-pc-linux-gnu-LTO :: offloading/bug51781.c

The diagnostic is:

/usr/bin/ld: unrecognised emulation mode: llvm=-openmp-opt-disable-spmdization
Supported emulations: elf_x86_64 elf32_x86_64 elf_i386 elf_iamcu elf_l1om elf_k1om i386pep i386pe
clang: error: linker command failed with exit code 1 (use -v to see invocation)
/tmp/llvm/llvm/llvm-mono-git/builds/explorer/llvm.org-main/bin/clang-linker-wrapper: error: 'clang' failed
clang: error: linker command failed with exit code 1 (use -v to see invocation)

However, if I configure with -DCLANG_DEFAULT_LINKER=lld, those tests pass. Additional system info:

$ ls -l /usr/bin/ld
lrwxrwxrwx 1 root root 19 Jan 23  2024 /usr/bin/ld -> x86_64-linux-gnu-ld
$ ls -l /usr/bin/x86_64-linux-gnu-ld
lrwxrwxrwx 1 root root 23 Jan 23  2024 /usr/bin/x86_64-linux-gnu-ld -> x86_64-linux-gnu-ld.bfd