Revert "TestFoundation: change CWD to TMPDIR and restore previous CWD when test finishes"#2610

compnerd wants to merge 1 commit intomasterswiftlang/swift-corelibs-foundation:masterfrom

revert-2606-droidswiftlang/swift-corelibs-foundation:revert-2606-droidCopy head branch name to clipboard