[issue4753] Faster opcode dispatch on gcc

[Ralph Corderoy]

Ralph Corderoy <ralph-pythonbugs at inputplus.co.uk> added the comment:

Regarding compressing the opcode table to make better use of cache; 
what if the most frequently occurring opcodes where placed together,
e.g. the opcodes were ordered by frequency, most frequent first.  Just
based on a one-off static analysis of a body of code.  A level one cache
line can be, what, 64 bytes == 16 32-bit pointers.

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nosy: +ralph.corderoy

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