Update lldb to trunk r290819 and resolve conflicts.

Update lldb to release_39 branch r276489 and resolve immediate conflicts.

Update LLDB snapshot to upstream r201577

Highlights include:

- Improvements to the remote GDB protocol client
(r196610, r197579, r197857, r200072)

- Bug fixes for big-endian targets
(r196808)

Update LLDB snapshot to upstream r201577

Highlights include:

- Improvements to the remote GDB protocol client
(r196610, r197579, r197857, r200072)

- Bug fixes for big-endian targets
(r196808)

- Initial support for libdispatch (GCD) queues in the debuggee
(r197190)

- Add "step-avoid-libraries" setting
(r199943)

- IO subsystem improvements (including initial work on a curses gui)
(r200263)

- Various bug fixes for memory leaks, LLDB segfaults, the C++ demangler,
ELF core files, DWARF debug info, and others.

Sponsored by: DARPA, AFRL

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