Fix LoongArch aliases and CS_OPT_SYNTAX_NO_DOLLAR support

[wargio]

Your checklist for this pull request

• I've documented or updated the documentation of every API function and struct this PR changes.
• I've added tests that prove my fix is effective or that my feature works (if possible)

Detailed description

For some reasons the CS_OPT_DETAIL_REAL and CS_OPT_SYNTAX_NO_DOLLAR were not supported in LoongArch, so it was impossible to get real info also from aliases.

[XVilka]

cc @jiegec @FurryAcetylCoA

[wargio]

Looks like also the alias mapping was missing. now it should be correct.

Before the patch suggested

 0  20 00 00 4c  ret
        ID: 322 (jirl)
        op_count: 3
                operands[0].type: REG = zero
                operands[0].access: WRITE
                operands[1].type: REG = ra
                operands[1].access: READ
                operands[2].type: IMM = 0x0
                operands[2].access: READ
        Registers read: ra
        Registers modified: zero

after applying the patch from @Rot127

 0  20 00 00 4c  ret
        ID: 322 (jirl)
        Is alias: 2058 ((null)) with REAL operand set
        op_count: 3
                operands[0].type: REG = zero
                operands[0].access: WRITE
                operands[1].type: REG = ra
                operands[1].access: READ
                operands[2].type: IMM = 0x0
                operands[2].access: READ
        Registers read: ra
        Registers modified: zero

After adding mapping of the aliases.

 0  20 00 00 4c  ret
        ID: 322 (jirl)
        Is alias: 2058 (ret) with REAL operand set
        op_count: 3
                operands[0].type: REG = zero
                operands[0].access: WRITE
                operands[1].type: REG = ra
                operands[1].access: READ
                operands[2].type: IMM = 0x0
                operands[2].access: READ
        Registers read: ra
        Registers modified: zero

[Rot127]

Only the suggestions, ten we are good to go.

[Rot127]

@kabeor

[kabeor]

LGTM, thank you.