RISC-V: fix some vsetvl debug info in pass's Phase 2 code [NFC]

RISC-V: fix some vsetvl debug info in pass's Phase 2 code [NFC]

When staring at VSETVL pass for PR/113429, spotted some minor
improvements.

1. For readablity, remove some redundant condition check in Phase 2
   function  earliest_fuse_vsetvl_info ().
2. Add iteration count in debug prints in same function.

gcc/ChangeLog:
	* config/riscv/riscv-vsetvl.cc (earliest_fuse_vsetvl_info):
	Remove redundant checks in else condition for readablity.
	(earliest_fuse_vsetvl_info) Print iteration count in debug
	prints.
	(earliest_fuse_vsetvl_info) Fix misleading vsetvl info
	dump details in certain cases.

Signed-off-by: Vineet Gupta <vineetg@rivosinc.com>