PR c/20740
	* c-format.c (init_dynamic_asm_fprintf_info): Give errors, not
	assertion failures, if __gcc_host_wide_int__ is not properly
	defined.
	(init_dynamic_diag_info): Give errors, not assertion failures, if
	location_t, tree or __gcc_host_wide_int__ are not properly
	defined.

testsuite:
	* gcc.dg/format/asm_fprintf-2.c, gcc.dg/format/asm_fprintf-3.c,
	gcc.dg/format/asm_fprintf-4.c, gcc.dg/format/asm_fprintf-5.c,
	gcc.dg/format/gcc_diag-2.c, gcc.dg/format/gcc_diag-3.c,
	gcc.dg/format/gcc_diag-4.c, gcc.dg/format/gcc_diag-5.c,
	gcc.dg/format/gcc_diag-6.c, gcc.dg/format/gcc_diag-7.c ,
	gcc.dg/format/gcc_diag-8.c, gcc.dg/format/gcc_diag-9.c: New tests.

From-SVN: r98800