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

Authored by JDevlieghere on Dec 7 2019, 5:35 PM.

Description

[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