PR c++/89974 - ICE on a definition of a non-type specialization on a struct object with pointer to member function

PR c++/89974 - ICE on a definition of a non-type specialization on a struct object with pointer to member function
PR c++/89878 - same specializations on a zero-initialized struct object as a non-type parameter treated as distinct
PR c++/89833 - sorry, unimplemented: string literal in function template signature
PR c++/47488 - sorry, unimplemented: string literal in function template signature

gcc/cp/ChangeLog:

	PR c++/89974
	PR c++/89878
	PR c++/89833
	PR c++/47488
	* decl.c (reshape_init_array_1): Strip trailing zero-initializers
	from arrays of trivial type and known size.
	* mangle.c (write_expression): Convert braced initializer lists
	to STRING_CSTs.
	(write_expression): Trim trailing zero-initializers from arrays
	of trivial type.
	(write_template_arg_literal): Mangle strings the same as braced
	initializer lists.

gcc/testsuite/ChangeLog:

	PR c++/89974
	PR c++/89878
	PR c++/89833
	PR c++/47488
	* gcc/testsuite/g++.dg/abi/mangle69.C: New test.
	* gcc/testsuite/g++.dg/abi/mangle70.C: New test.
	* gcc/testsuite/g++.dg/abi/mangle71.C: New test.
	* gcc/testsuite/g++.dg/abi/mangle72.C: New test.
	* gcc/testsuite/g++.dg/cpp0x/constexpr-array19.C: New test.
	* gcc/testsuite/g++.dg/cpp2a/nontype-class15.C: New test.
	* gcc/testsuite/g++.dg/cpp2a/nontype-class16.C: New test.
	* gcc/testsuite/g++.dg/init/array51.C: New test.

From-SVN: r270155