PR c++/39751: ICE-on-invalid parsing regression.

PR c++/39751: ICE-on-invalid parsing regression.

This is a fix for PR c++/39751 which is an ICE-on-invalid regression in
the C++ parser after encountering the end of file.  The one line change
is to check that the tokens cached in DECL_PENDING_INLINE_INFO haven't
been purged before processing them in cp_parser_late_parsing_for_member.

2022-03-10  Roger Sayle  <roger@nextmovesoftware.com>

gcc/cp/ChangeLog
	PR c++/39751
	* parser.cc (cp_parser_late_parsing_for_member): Confirm the token
	stream hasn't been purged before processing DECL_PENDING_INLINE.

gcc/testsuite/ChangeLog
	PR c++/39751
	* g++.dg/parse/pr39751.C: New test case.