Assembly of `lea rXX, XXX` instructions produces wrong machine code.

[Semnodime]

Environment information

• Operating System: linuxmint 20.1
• Cutter version: 1.12.0 Using rizin-0.1.0-git
• File format: elf64
  • Arch: x86 (AMD x86-64 architecture)
  • Type: EXEC (Executable file)

Describe the bug Assembly of lea rXX, XXX instructions produces wrong machine code (the second nibble is wrong): For rXX = r8...r15, rXX gets wrongly turned into rax, rcx, rdx, rbx, rsp, rbp, rsi, rdi. e.g. lea r12, [rsp+0x10] -> 488d642410 (which is correctly disassembled to lea rsp, [rsp + 0x10].

To Reproduce Steps to reproduce the behavior:

1. Open Cutter with any elf64 x86
2. Disassembly Tab -> Right click on any line of machine code -> Edit -> Instruction -> e.g. lea r12, [rsp+0x10]
3. See error

Expected behavior Correct assembly: e.g. lea r12, [rsp+0x10] -> 4c8d642410

[ret2libc]

This is very likely an issue for Rizin. I'm moving it there. Also, it seems to be in the x86 internal assembler. I bet x86.ks plugin (keystone) can disassemble this correctly.