[compiler-rt] [compiler-rt][test] Fix typo in stderr redirection (PR #98397)

[via llvm-commits]

connieyzhu wrote:

cc: @ilovepi @petrhosek @vitalybuka This seems like a typo in redirecting stderr to stdout, but was 2<&1 the intended syntax instead of 2>&1?

https://github.com/llvm/llvm-project/pull/98397