Backport REPL changes for Swift REPL completion fix#678

Merged

Teemperor merged 3 commits intoswiftlang:apple/stable/20190619from

Teemperor:ChangeREPLForSwift

Jan 29, 2020

Commits on Jan 28, 2020

[lldb/pexpect] Force-set the TERM environment variable

labath
authored and
Teemperor
committed
[lldb] Fix that CompletionRequestGetRawLineUntilCursor returns the wrong result
Teemperor
committed

Commits on Jan 29, 2020

[lldb] Use CompletionRequest in REPL::CompleteCode and remove translation code to old API
Teemperor
committed