[lit] Make internal diff work in pipelines
When using lit's internal shell, RUN lines like the following
accidentally execute an external `diff` instead of lit's internal
`diff`:
```
# RUN: program | diff file -
# RUN: not diff file1 file2 | FileCheck %s
```
Such cases exist now, in `clang/test/Analysis` for example. We are
preparing patches to ensure lit's internal `diff` is called in such
cases, which will then fail because lit's internal `diff` cannot
currently be used in pipelines and doesn't recognize `-` as a
command-line option.
To enable pipelines, this patch moves lit's `diff` implementation into
an out-of-process script, similar to lit's `cat` implementation. A
follow-up patch will implement `-` to mean stdin.
Also, when lit's `diff` prints differences to stdout in Windows, this
patch ensures it always terminate lines with `\n` not `\r\n`. That
way, strict FileCheck directives checking the `diff` output succeed in
both Linux and Windows. This wasn't an issue when `diff` was internal
to lit because `diff` didn't then write to the true stdout, which is
where the `\n` -> `\r\n` conversion happened in Python.
Reviewed By: probinson, stella.stamenova
Differential Revision: https://reviews.llvm.org/D66574