[cfe-dev] Knowing if a default argument was inherited.

[Enea Zaffanella]

Hello.

The attached patch adds a Boolean flag (named HasInheritedDefaultArg) to 
ParmVarDecl nodes. The flag (normally false) allows to distinguish those 
parameters having a written default argument from those inheriting such 
a default argument (when merging the current function declaration with a 
a previous one).

Cheers,
Enea Zaffanella.
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