select_nth_unstable (partition_at_index) has plenty of redundant bounds checks #144326
Description
I wouldn't expect any panics other than panic_on_ord_violation and input arguments check, which should get optimized out.
https://rust.godbolt.org/z/h5P6Er8zr
.LBB2_96: lea rax, [rip + .Lanon.c0a2eb89440bc2e212dbf84361b066b5.10] mov qword ptr [rsp + 24], rax mov qword ptr [rsp + 32], 1 mov qword ptr [rsp + 40], 8 xorps xmm0, xmm0 movups xmmword ptr [rsp + 48], xmm0 lea rsi, [rip + .Lanon.c0a2eb89440bc2e212dbf84361b066b5.13] lea rdi, [rsp + 24] call qword ptr [rip + core::panicking::panic_fmt::h22107f1a113fdabe@GOTPCREL] .LBB2_97: lea rax, [rip + .Lanon.c0a2eb89440bc2e212dbf84361b066b5.10] mov qword ptr [rsp + 24], rax mov qword ptr [rsp + 32], 1 mov qword ptr [rsp + 40], 8 xorps xmm0, xmm0 movups xmmword ptr [rsp + 48], xmm0 lea rsi, [rip + .Lanon.c0a2eb89440bc2e212dbf84361b066b5.14] lea rdi, [rsp + 24] call qword ptr [rip + core::panicking::panic_fmt::h22107f1a113fdabe@GOTPCREL] .LBB2_95: ud2 .LBB2_15: lea rdx, [rip + .Lanon.c0a2eb89440bc2e212dbf84361b066b5.12] mov rsi, r13 call qword ptr [rip + core::panicking::panic_bounds_check::hdaa6e5107cd75dd9@GOTPCREL] .LBB2_24: lea rdx, [rip + .Lanon.c0a2eb89440bc2e212dbf84361b066b5.11] mov rsi, r13 call qword ptr [rip + core::panicking::panic_bounds_check::hdaa6e5107cd75dd9@GOTPCREL]