INVALID opcodes to reflect their true meaning.
Rename the opcodes as follows:
EXTBALANCEto be in line with
BLOCKGASLIMITto avoid confusion with the gas limit of the transaction
GASLEFTto be clear what it refers to
ABORTto clearly articulate when someone refers this opcode as opposed to "any invalid opcode"
# Backwards Compatibility
This has no effect on any code. It can influence what mnemonics assemblers will use.
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