EIP-214 STATICCALL

Documentation for tests/byzantium/eip214_staticcall@7b8124a7.

Generate fixtures for these test cases for Bpo2 with:

fill -v tests/byzantium/eip214_staticcall --fork Bpo2

Test cases for EIP-214: STATICCALL opcode.

EIP-214 introduced the STATICCALL opcode which creates a read-only call context. Any state-modifying operations (including CALL with non-zero value) within a STATICCALL context will cause the call to fail.