EIP141 - Designated invalid EVM instruction

# Abstract

An instruction is designated to remain as an invalid instruction.

# Motivation

The invalid instruction can be used as a distinct reason to abort execution.

# Specification

The opcode 0xfe is the INVALID instruction. It can be used to abort the execution (i.e. duplicates as an ABORT instruction).

# Backwards Compatibility

This instruction was never used and therefore has no effect on past contracts.

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