* valops.c (value_cast): A cast might also change the object

	* valops.c (value_cast): A cast might also change the object
	representation in C++.
	* dbxread.c (end_psymtab): Copy subpst read_symtab function from pst
	to get the proper read_symtab function when called from mipsread.c.
	* mipsread.c (mipscoff_psymtab_to_symtab, psymtab_to_symtab_1):
	Set cur_bfd in psymtab_to_symtab_1 as CURBFD(pst) is invalid
	for dummy psymtabs, inhibit processing of dummy psymtabs.