LinAlg Validation: MatrixMultiplyAccumulate

[V-FEXrt]

From the spec:

Validation rules will enforce that:

• argument A is an A matrix
• argument B is a B matrix
• argument C is an Accumulator matrix
• return value (R) is an Accumulator matrix
• All four matrices have the same scope (Wave or ThreadGroup)
• Matrix A's dimensions shall be M x K
• Matrix B's dimensions shall be K x N
• Matrix C's dimensions shall be M x N
• Matrix R's dimensions shall be M x N
• The element types are compatible