S/390 Vector ABI GNU Attribute.

S/390 Vector ABI GNU Attribute.

gcc/
	* config/s390/s390.c (s390_vector_abi): New variable definition.
	(s390_check_type_for_vector_abi): New function.
	(TARGET_ASM_FILE_END): New macro definition.
	(s390_asm_file_end): New function.
	(s390_function_arg): Call s390_check_type_for_vector_abi.
	(s390_gimplify_va_arg): Likewise.
	* configure: Regenerate.
	* configure.ac: Check for .gnu_attribute Binutils feature.

gcc/testsuite/
	* gcc.target/s390/vector/vec-abi-1.c: Add gnu attribute check.
	* gcc.target/s390/vector/vec-abi-attr-1.c: New test.
	* gcc.target/s390/vector/vec-abi-attr-2.c: New test.
	* gcc.target/s390/vector/vec-abi-attr-3.c: New test.
	* gcc.target/s390/vector/vec-abi-attr-4.c: New test.
	* gcc.target/s390/vector/vec-abi-attr-5.c: New test.
	* gcc.target/s390/vector/vec-abi-attr-6.c: New test.

From-SVN: r224867