[Patch PR78561 PowerPC] Revert to old behaviour for counting constant pools

[Patch PR78561 PowerPC] Revert to old behaviour for counting constant pools

gcc/

	PR rtl-optimization/78561
	* config/rs6000/rs6000.c (rs6000_reg_live_or_pic_offset_p) Use
	constant_pool_empty_p in place of get_pool_size_upper_bound.
	(rs6000_stack_info): Likewise.
	(rs6000_emit_prologue): Likewise.
	(rs6000_elf_declare_function_name): Likewise.
	(rs6000_set_up_by_prologue): Likewise.
	(rs6000_can_eliminate): Likewise.
	* output.h (get_pool_size_upper_bound): Delete.
	(constant_pool_empty_p): New.
	* varasm.c (get_pool_size_upper_bound): Delete
	(constant_pool_empty_p): New.

From-SVN: r243345