[Patch 1/2 PR78561] Rename get_pool_size to get_pool_size_upper_bound

[Patch 1/2 PR78561] Rename get_pool_size to get_pool_size_upper_bound

gcc/

	PR rtl-optimization/78561
	* config/rs6000/rs6000.c (rs6000_reg_live_or_pic_offset_p) Rename
	get_pool_size to 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, reformat spaces to tabs.
	* output.h (get_pool_size): Rename to...
	(get_pool_size_upper_bound): ...This.
	* varasm.c (get_pool_size): Rename to...
	(get_pool_size_upper_bound): ...This.

From-SVN: r243182