[lit] Extend internal diff to support -U

[lit] Extend internal diff to support -U

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 -U1 file -
```

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` doesn't
recognize `-U` as a command-line option.  This patch adds `-U`
support.

Reviewed By: rnk

Differential Revision: https://reviews.llvm.org/D68668

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@374392 91177308-0d34-0410-b5e6-96231b3b80d8