[clang] remove code duplication

[Nathan Sidwell]

Richard,
in looking at 18432, I came across some duplicated code in 
Parser::HandleMemberFunctionDeclDelays.  This patch[*] rearranges things to 
avoid such a duplication.  Basically do an early check of the parameters to see 
if there are any default args.

tested on x86_64-linux-gnu, ok?

nathan

[*] no tabs, now I've configured xemacs
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