benjaminion 3299c479b6 LLL: fix handling of "sha3" expression
When PR #2317 changed the EVM opcode from SHA3 to KECCAK256 it broke the `(sha3 loc len)` expression in LLL. This PR fixes things while allowing existing code using the sha3 expression (such as the ENS registrar) to continue to compile.  I.e. both `(keccak256 loc len)` and `(sha3 loc len)` may be used, and the existing related sha3 macros continue to work.

Three end-to-end test cases have been added for kekkac256 and sha3.
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The Solidity Contract-Oriented Programming Language

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Solidity, the Smart Contract Programming Language
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