* riscv: Update opcodes from binutils-gdb
Update to riscv opcodes from
[riscv-binutils-gdb](https://github.com/riscv/riscv-binutils-gdb/commit/08219b2)
git 08219b2.
* riscv: set no_alias=false while disassembling
I'm not sure what the rationale was for setting no_alias to true
originally. But setting it to false means that shorter and (usually)
better readable aliases for instructions will be shown:
Before | After
---------------------+------------
`c.jr ra` | `ret`
`addi a5, zero, 123` | `li a5,123`
`jal zero, 0x101dc` | `j 0x101dc`
And so on.
