Changes

Revert r374657: "[lit] Try again to fix new tests that fail on Windows
bots"
llvm-svn: 374664

[lit] Try yet again to fix new tests that fail on Windows bots
I seem to have misread the bot logs on my last attempt.  When lit's 
internal diff runs on Windows under Python 2.7, it's text diffs not 
binary diffs that need decoding to avoid this error when writing the 
diff to stdout:
``` UnicodeEncodeError: 'ascii' codec can't encode characters in
position 7-8: ordinal not in range(128)
```
There is no `decode` attribute in this case under Python 3.6.8 under 
Ubuntu, so this patch checks for the `decode` attribute before using it
here.  Hopefully nothing else is needed when `decode` isn't available.
It might take a couple more attempts to figure out what error handling,
if any, is needed for this decoding.
llvm-svn: 374665