OpenQASM3/MLIR: SSA value chain with qreg alias/slicing

Created by: tnguyen-ornl

Example

OPENQASM 3;
include "qelib1.inc";
qubit q[6];
let myreg = q[1, 3, 5];

x q[1];
t myreg[0];
x q[1];

MLIR (simplified)

 %2 = q.extract(%0, %c1_i64) : !quantum.Qubit
 %3 = qvs.x(%2) : !quantum.Qubit
 %4 = q.extract(%1, %c0_i64) : !quantum.Qubit
 %5 = qvs.t(%4) : !quantum.Qubit
 %6 = qvs.x(%3) : !quantum.Qubit

This is buggy: two X gates become SSA-connected (%3) incorrectly.