[PATCH, 3.4] Backport several C++ patches

[Giovanni Bajo]

Hello,

this patch backports a few C++ patches to the 3.4 branch. The backports are
mostly obvious.

The only non-trivial change I had to make was to add a function to grep the
decl_specifiers for a 'typedef': I put the code into a new function
cp_parser_typedef_p, which is copy-n-pasted from cp_parser_friend_p. The
mainline version of the patch uses the new specific data structure for
decl_specifiers, which requires no tree traversal.

Tested on i686-pc-linux-gnu, OK for 3.4?

Giovanni Bajo
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