llvm-project

57683c6b - [clang-tools-extra] Remove use of REQUIRES: shell (#173313)

[clang-tools-extra] Remove use of REQUIRES: shell (#173313) REQUIRES: shell does not have the intended effect now that the internal shell is enabled by default and only prevents tests from running on Windows. This patch removes the directive for portable tests and switches it to a UNSUPPORTED: system-windows tag for non-portable tests to make the intention more clear.