[lldb/Lua] Support loading Lua modules

Implements the command script import command for Lua.

Differential revision: https://reviews.llvm.org/D71825

[lldb/Lua] Make lldb.debugger et al available to Lua

The Python script interpreter makes the current debugger, target,
process, thread and frame available to interactive scripting sessions
through c

[lldb/Lua] Make lldb.debugger et al available to Lua

The Python script interpreter makes the current debugger, target,
process, thread and frame available to interactive scripting sessions
through convenience variables. This patch does the same for Lua.

Differential revision: https://reviews.llvm.org/D71801

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[Lldb/Lua] Persist Lua state across script interpreter calls.

Don't create a new lua state on every operation. Share a single state
across the lifetime of the script interpreter. Add simple locking

[Lldb/Lua] Persist Lua state across script interpreter calls.

Don't create a new lua state on every operation. Share a single state
across the lifetime of the script interpreter. Add simple locking to
prevent two threads from modifying the state concurrently.

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[lldb/Lua] Implement a Simple Lua Script Interpreter Prototype

This implements a very elementary Lua script interpreter. It supports
running a single command as well as running interactively. It use

[lldb/Lua] Implement a Simple Lua Script Interpreter Prototype

This implements a very elementary Lua script interpreter. It supports
running a single command as well as running interactively. It uses
editline if available. It's still missing a bunch of stuff though. Some
things that I intentionally ingored for now are that I/O isn't properly
hooked up (so every print goes to stdout) and the non-editline support
which is not handling a bunch of corner cases. The latter is a matter of
reusing existing code in the Python interpreter.

Discussion on the mailing list:
http://lists.llvm.org/pipermail/lldb-dev/2019-December/015812.html

Differential revision: https://reviews.llvm.org/D71234

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[lldb/Lua] Add Boilerplate for a Lua Script Interpreter

This adds the boilerplate necessary to support the Lua script
interpreter. The interpreter is not functional yet and just reports that
it's no

[lldb/Lua] Add Boilerplate for a Lua Script Interpreter

This adds the boilerplate necessary to support the Lua script
interpreter. The interpreter is not functional yet and just reports that
it's not implemented.

Discussion on the mailing list:
http://lists.llvm.org/pipermail/lldb-dev/2019-December/015812.html

Differential revision: https://reviews.llvm.org/D71232

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