[PATCH] Whitespace issues during preprocessing

[Harald van Dijk]

Hi all,

Attached are my updated patches intended to fix various whitespace
issues in clang, modified to take Justin Bogner's comments into account.
They are intended to ensure that whitespace is not inappropriately
removed just because a macro or macro argument expansion is empty, and
does get removed during token pasting.

I have moved the handling of invalid token pastes from
TokenLexer::ExpandFunctionArguments to TokenLexer::Lex, so that it works
for both object- and function-like macros, and both when ##'s operands
use macro parameters and when they don't.

Do these changes look okay now? If so, would someone be so kind as to
commit them for me?

Cheers,
Harald van Dijk
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