Fix memory allocation size overflows (PR69687, patch by Marcel Böhme)

Fix memory allocation size overflows (PR69687, patch by Marcel Böhme)

	PR c++/69687
	* cplus-dem.c: Include <limits.h> if available.
	(INT_MAX): Define if necessary.
	(remember_type, remember_Ktype, register_Btype, string_need):
	Abort if we detect cases where we the size of the allocation would
	overflow.

From-SVN: r234829