MFC r263678: lldb: Invoke PT_KILL from ProcessPosix::DoDestroy

We previously sent SIGKILL to the debuggee in DoDestroy, but did not
actually detach or kill via ptrace. It seems that this somehow didn't
matter on Linux, but did on FreeBSD.

This would happen when quitting LLDB while stopped at a breakpoint, for
example. The debuggee remained stopped in ptrace (with the signal
either pending or lost). After a timeout of a second or two LLDB exits,
which caused the debuggee to resume and dump core from an unhandled
SIGTRAP.

BringProcessIntoLimbo is a poorly named wrapper for ptrace(PT_KILL)
which is the desired behaviour from DoDestroy.

http://llvm.org/pr18894

Sponsored by: DARPA, AFRL

MFC r262528: Update LLDB snapshot to upstream r202189

Highlights include (upstream revs in parens):

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

- 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)

- Support hardware watchpoints on FreeBSD
(r201706)

- Improved unwinding through hand-written assembly functions
(r201839)

- Handle DW_TAG_unspecified_parameters for variadic functions
(r202061)

- Fix Ctrl+C interrupting a running inferior process
(r202086, r202154)

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

Sponsored by: DARPA, AFRL

MFC r258892: lldb: Threaded inferior support for FreeBSD

This is in the process of being submitted to the upstream LLDB
repository. The thread list functionality is modelled in part on
GDBRemoteCommunicationClient.

LLDB bug pr16696 and code review D2267

Sponsored by: DARPA, AFRL

MFC r258054: Update LLDB to upstream r194122 snapshot

Inludes minor changes relative to upstream, for compatibility with
FreeBSD's in-tree LLVM 3.3:

- Reverted LLDB r191806, restoring use of previous API.
- Reverted part of LLDB r189317, restoring previous enum names.
- Work around missing LLVM r192504, using previous registerEHFrames API
(limited functionality).
- Removed PlatformWindows header include and init/terminate calls.

Sponsored by: DARPA, AFRL

MFC r263678: lldb: Invoke PT_KILL from ProcessPosix::DoDestroy

We previously sent SIGKILL to the debuggee in DoDestroy, but did not
actually detach or kill via ptrace. It seems that this somehow didn't
matter on Linux, but did on FreeBSD.

This would happen when quitting LLDB while stopped at a breakpoint, for
example. The debuggee remained stopped in ptrace (with the signal
either pending or lost). After a timeout of a second or two LLDB exits,
which caused the debuggee to resume and dump core from an unhandled
SIGTRAP.

BringProcessIntoLimbo is a poorly named wrapper for ptrace(PT_KILL)
which is the desired behaviour from DoDestroy.

http://llvm.org/pr18894

Sponsored by: DARPA, AFRL

MFC r262528: Update LLDB snapshot to upstream r202189

Highlights include (upstream revs in parens):

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

- 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)

- Support hardware watchpoints on FreeBSD
(r201706)

- Improved unwinding through hand-written assembly functions
(r201839)

- Handle DW_TAG_unspecified_parameters for variadic functions
(r202061)

- Fix Ctrl+C interrupting a running inferior process
(r202086, r202154)

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

Sponsored by: DARPA, AFRL

MFC r258892: lldb: Threaded inferior support for FreeBSD

This is in the process of being submitted to the upstream LLDB
repository. The thread list functionality is modelled in part on
GDBRemoteCommunicationClient.

LLDB bug pr16696 and code review D2267

Sponsored by: DARPA, AFRL

MFC r258054: Update LLDB to upstream r194122 snapshot

Inludes minor changes relative to upstream, for compatibility with
FreeBSD's in-tree LLVM 3.3:

- Reverted LLDB r191806, restoring use of previous API.
- Reverted part of LLDB r189317, restoring previous enum names.
- Work around missing LLVM r192504, using previous registerEHFrames API
(limited functionality).
- Removed PlatformWindows header include and init/terminate calls.

Sponsored by: DARPA, AFRL