It reduces the memory usage in lldb-server.

This allows release teams to customize the bug report url for lldb. It
also removes unnecessary constructions of
`llvm::PrettyStackTraceProgram` as it's already constructed inside
`llvm::InitLLVM`.

Because of its dependency on clang (and potentially other compilers
downstream, such as swift) lldb_private::GetVersion already lives in its
own library called lldbBase. Despite that, its implementation was spread
across unrelated files. This patch improves things by introducing a
Version library with its own directory, header and implementation file.

The benefits of this patch include:

 - We can get rid of the ugly quoting macros.
 - Other parts of LLDB can read the version number from
   lldb/Version/Version.inc.
 - The implementation can be swapped out for tools like lldb-server than
   don't need to depend on clang at all.

Differential revision: https://reviews.llvm.org/D115211

This reverts commit e387c8c413e2127bc93950fb6d786290237b4a9f. The
TestErrorMessages.test is failing on the Linux bots.

This diff modifies the LLDB server return codes to more accurately reflect usage
error paths. Specifically we always propagate the return codes from the main
entrypoints into GDB remote LLDB server, and platform LLDB server. This way, the
top-level caller of LLDB server will be able to correctly check whether the
executable exited with or without an error.

We additionally modify and extend the associated shell unit tests to expect
nonzero return codes on error conditions.

Test Plan:
LLDB tests pass:

```
ninja check-lldb
```

Reviewed By: teemperor

Differential Revision: https://reviews.llvm.org/D108351

The C headers are deprecated so as requested in D102845, this is replacing them
all with their (not deprecated) C++ equivalent.

Reviewed By: shafik

Differential Revision: https://reviews.llvm.org/D103084

Print LLVM's pretty stack trace when lldb-vscode crashes. Also removes
the unnecessary call to PrintStackTraceOnErrorSignal in lldb-server as
it's already part of InitLLVM.

Differential revision: https://reviews.llvm.org/D99535

Allow clients of the llvm library to opt-in to one-shot SIGPIPE
handling, instead of forcing them to undo llvm's SIGPIPE handler
registration (which is brittle).

The current behavior is preserved for all llvm-derived tools (except
lldb) by means of a default-`true` flag in the InitLLVM constructor.

This prevents "IO error" crashes in long-lived processes (lldb is the
motivating example) which both a) load llvm as a dynamic library and b)
*really* need to ignore SIGPIPE.

As llvm signal handlers can be installed when calling into libclang
(say, via RemoveFileOnSignal), thereby overriding a previous SIG_IGN for
SIGPIPE, there is no clean way to opt-out of "exit-on-SIGPIPE" in the
current model.

Differential Revision: https://reviews.llvm.org/D70277

This should allow lldb-server to operate on files with non-ascii
pathnames.

I tried looking around in lldb/tools, and this seemed like the only
other tool (other than the main lldb driver itself) that would be
used (implicitly) by an end user (which could be working in
non-ascii paths).

Differential Revision: https://reviews.llvm.org/D68864

llvm-svn: 374537

Now that we've moved to C++14, we no longer need the llvm::make_unique
implementation from STLExtras.h. This patch is a mechanical replacement
of (hopefully) all the llvm::make_unique instances across the monorepo.

Differential revision: https://reviews.llvm.org/D66259

llvm-svn: 368933