[issue4753] Faster opcode dispatch on gcc

[Andrew I MacIntyre]

Andrew I MacIntyre <aimacintyre at users.sourceforge.net> added the comment:

Out of interest, the attached patch against the py3k branch at r70516
cleans up the threaded code changes a little:
- gets rid of TARGET_WITH_IMPL macro;
- TARGET(op) is followed by a colon, so that it looks like a label (for
editors that make use of that).

On my systems (all older AMD with old versions of gcc), this patch has
performance slightly better than SVN r70516, and performance is
usually very close to the NO_COMPUTED_GOTOS build.

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nosy: +aimacintyre
Added file: http://bugs.python.org/file13392/ceval.c.threadcode-tidyup.patch

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