[PATCH] Whitespace issues during preprocessing

[Harald van Dijk]

Hi all,

Quite a while ago, I noticed that clang had some preprocessor issues
with whitespace when macro arguments were empty, and reported that at
<http://llvm.org/bugs/show_bug.cgi?id=15675>. I've now taken a closer
look, and found a few more problems. Attached are three patches that
should address these problems, and one patch that has no functional
effect but makes the code a bit easier to follow. They include new tests
and tweak one existing test. All tests pass, and to make sure I am not
misinterpreting the standard, I've verified that all new and changed
tests also pass with GCC.

Any thoughts or comments? Can these patches be committed?

Cheers,
Harald van Dijk
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