GCSE: Export 'insert_insn_end_basic_block' as global function

Since VSETVL PASS in RISC-V port is using common part of 'insert_insn_end_basic_block (struct gcse_expr *expr, basic_block bb)'
and we will also this helper function in riscv.cc for the following patches.

So extract the common part codes of 'insert_insn_end_basic_block (struct gcse_expr *expr, basic_block bb)', the new function
of the common part is also call 'insert_insn_end_basic_block (rtx_insn *pat, basic_block bb)' but with different arguments.
And call 'insert_insn_end_basic_block (rtx_insn *pat, basic_block bb)' in 'insert_insn_end_basic_block (struct gcse_expr *expr, basic_block bb)'
and VSETVL PASS in RISC-V port.

Remove redundant codes of VSETVL PASS in RISC-V port.

gcc/ChangeLog:

	* config/riscv/riscv-vsetvl.cc (add_label_notes): Remove it.
	(insert_insn_end_basic_block): Ditto.
	(pass_vsetvl::commit_vsetvls): Adapt for new helper function.
	* gcse.cc (insert_insn_end_basic_block):  Export as global function.
	* gcse.h (insert_insn_end_basic_block): Ditto.

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