[C++ PATCH] Avoid some token copying

[Nathan Sidwell]

This patch changes the token saving mechanism for inline member functions
and the like.  We can simply point to the tokens in the parent lexer's
buffer.  It also removes some of the gunk that was necessary when
the lexer's token buffer was a circular buffer.

Now that parser debugging is enabled with ENABLE_CHECKING, there's
no real need for cp_lexer_peek_token_emit_debug_info to be a separate
function, so it's folded into peek_token.

Mark, is
	#define CP_SAVED_TOKEN_STACK 5
the maximum depth of that stack, or merely a good default?

This gives about .3% speedup.

booted & tested on i686-pc-linux-gnu.

nathan
-- 
Nathan Sidwell    ::   http://www.codesourcery.com   ::     CodeSourcery LLC
nathan@codesourcery.com    ::     http://www.planetfall.pwp.blueyonder.co.uk

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