Disallow contrained prefix opcode.
Disallow contrained prefix opcode.

Disallow initblk, cpblk, ldftn, ldvirtftn.

Add "TODO" opcode calli.

IgniteInteractiveStudio/SLSharp,IgniteInteractiveStudio/SLSharp,hach-que/SLSharp,hach-que/SLSharp,pratikv/SLSharp,pratikv/SLSharp