[issue4753] Faster opcode dispatch on gcc

[Paolo 'Blaisorblade' Giarrusso]

Paolo 'Blaisorblade' Giarrusso <p.giarrusso at gmail.com> added the comment:

-fno-gcse is controversial.
Even if it might avoid jumps sharing, the impact of that option has to
be measured, since common subexpression elimination allows omitting some
recalculations, so disabling global CSE might have a negative impact on
other code.

It would be maybe better to disable GCSE only for the interpreter loop,
but that would make some intra-file inlining impossible.

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