MS gate inverse is not implemented correctly.

[lucas-slattery]

Cirq/cirq-ionq/cirq_ionq/ionq_native_gates.py

Line 244 in 7fe741b

def __pow__(self, power):

MS gate inverse should be done with referencing new theta value. inverse of MS(phi0,phi1,theta) = MS(phi0 + 0.5, phi1, theta)

[radumarg]

Will take a look at this.

[radumarg]

Fixing in PR: #7466