negu not detected as alias of subu.

[Rot127]

Work environment

Questions	Answers
System Capstone runs on OS/arch/bits	Fedora x86_64
Capstone module affected	Mips
Source of Capstone	git clone
Version/git commit	8ac2843 (HEAD, tag: 6.0.0-Alpha3)

Instruction bytes giving faulty results

cstool -d -r mips 00071823
 0  00 07 18 23  negu	$v1, $a3
	ID: 66 (subu)
	Is alias: 0 (invalid) with REAL operand set
	op_count: 3
		operands[0].type: REG = v1
		operands[0].is_reglist: false
		operands[1].type: REG = zero
		operands[1].is_reglist: false
		operands[2].type: REG = a3
		operands[2].is_reglist: false
	Groups: HasStdEnc NotInMicroMips NotNanoMips 

Expected results

It should be:

	ID: 66 (subu)
	Is alias: <ALIAS_ID> (negu) with REAL operand set
...

Steps to get the wrong result

With cstool:

cstool -d -r mips 00071823

Additional Logs, screenshots, source code, configuration dump, ...

...