[WIP; depends on #232] Metropolis: EIP211 Returndata instructions#264

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pirapira wants to merge 7 commits intoethereum:metropolisfrom pirapira:returndata

+17-3

Commits on Mar 22, 2017

EIP 211: CREATE resets the previous return data
pirapira
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Commits on May 9, 2017

Move RETURNDATACOPY and RETURNDATASIZE to the 0x3. block
pirapira
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Commits on Jun 21, 2017

RETURNDATACOPY throws when it would overrun the return data buffer
pirapira
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