re PR target/14454 (virtual function with vararg won't compile)

re PR target/14454 (virtual function with vararg won't compile)

	PR target/14454
	* config/sparc/sparc.c (TARGET_ASM_CAN_OUTPUT_MI_THUNK): Set to
	sparc_can_output_mi_thunk.
	(sparc_output_mi_thunk): Simplify handling of delta offset.  Add
	handling of vcall offset.
	(sparc_can_output_mi_thunk): New predicate.
	* doc/tm.texi (TARGET_ASM_OUTPUT_MI_THUNK): Document VCALL_OFFSET.
	(TARGET_ASM_OUTPUT_MI_VCALL_THUNK): Delete.
	(TARGET_ASM_CAN_OUTPUT_MI_THUNK): New target hook.

	* config/sparc/sparc.c (emit_and_preserve): Preserve stack alignment.

	* config/sparc/sparc.md (movdi): Remove redundant test.

From-SVN: r88985