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Summary: Quote the value of environment variables when passing them to the SSH client in SSHExecutor in libc++'s lit utilities. Without the quotes, an environment variable like FOO="buzz bar" gets passed incorrectly like this, ssh env FOO=buzz bar, which causes bar to be treated as a command to run, not part of the environment variable value. We ran into this when using SSHExecutor to do bringup of our CUDA libcu++ port on an embedded aarch64 system. Patch by Bryce Adelstein Lelbach. Differential Revision: https://reviews.llvm.org/D65960 git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@368317 91177308-0d34-0410-b5e6-96231b3b80d8