benchmark: add __MANGLED_FUNCTION__ special keyword to the lexer and parser

[ljmf00]

Signed-off-by: Luís Ferreira contact@lsferreira.net

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CC: @maxhaton
Related to dlang/dmd#12252.

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[RazvanN7]

@ljmf00 This seems to be stalled on dlang/dmd#12252 which is also stalled. How do we proceed here?

[ljmf00]

@ljmf00 This seems to be stalled on dlang/dmd#12252 which is also stalled. How do we proceed here?

I think this is not to be implemented in favour of the trait described during the discussion of the referred PR. I will try to revive the trait implementation from the ghost user.