[Bug default/30260] add support for pointer-to-member types

["gprocida at google dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=30260

--- Comment #2 from gprocida at google dot com ---
Naming of these types appears to follow all the same rules as naming normal
pointer types, including when parentheses are needed.

pointer to: ... * ...

becomes

pointer to X member: ... X::* ...

Extra complications are:

1. the syntax immediately to the left of the * or X::* may need to be separated
by a space

int*x; // no space needed before *
int X::*x; // space is needed before X
int (X::*x)(); // space would look odd inside the bracket

2. this is normally written as just the tag, without struct / class / union

but you might want to include the keyword for clarity or for simplicity of
coding

int struct X::*x;

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