OperationDef as macros.

[PapyChacal]

Switch current OperationDef construction logic to macros - meaning the OperationDef value is constructed at macro-execution time.
Thus we can use it directly as input to the codegen macros, and actually erase the OperationDef value at runtime, only keeping the necesarry infromatin as litterals.

Leverage this to refactor a few first things in the codegen macros too.

@baymaks, bonus point, this indeed generates:

  public java.lang.String getName();
    Code:
       0: ldc           #28                 // String cmathv2.mulv2
       2: areturn

[baymaks]

💪 😎 👍