[issue4753] Faster opcode dispatch on gcc

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

Andrew, your patch disables the optimization that HAS_ARG(op) is a
constant when op is known by the compiler (that is, inside a
"TARGET_##op" label), so I'd rather keep the version which is currently
in SVN.

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versions:  -Python 3.1

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