[PATCH RFA (print-tree)] c++: improve print_node of PTRMEM_CST

[Jakub Jelinek]

On Thu, Nov 04, 2021 at 11:52:34AM -0400, Jason Merrill via Gcc-patches wrote:
> It's been inconvenient that pretty-printing of PTRMEM_CST didn't display
> what member the constant refers to.
> 
> Adding that is complicated by the absence of a langhook for CONSTANT_CLASS_P
> nodes; the simplest fix for that is to use the tcc_exceptional hook for
> tcc_constant as well.
> 
> Tested x86_64-pc-linux-gnu.  OK for trunk, or should I add a new hook for
> constants?
> 
> gcc/cp/ChangeLog:
> 
> 	* ptree.c (cxx_print_xnode): Handle PTRMEM_CST.
> 
> gcc/ChangeLog:
> 
> 	* print-tree.c (print_node): Also call print_xnode hook for
> 	tcc_constant class.

I think using the same langhook is fine, but in that case certainly
  /* Called by print_tree when there is a tree of class tcc_exceptional
     that it doesn't know how to display.  */
should be adjusted so that it mentions also tcc_constant.
And maybe rename it from print_xnode to print_node?

	Jakub