EVM version check

[totoroXD]

Should check EVM version parameter when codegen Lity-only instruction set.

Currently, these functions have never been used.

lity/libsolidity/interface/EVMVersion.h

Lines 80 to 83 in 4f90b5f

	bool hasENI() const {return *this == lity(); }
	bool hasIsValidator() const {return *this == lity(); }
	bool hasFreeGas() const {return *this == lity(); }
	bool hasRand() const {return *this == lity(); }