[issue2506] Add mechanism to disable optimizations

[STINNER Victor]

STINNER Victor added the comment:

> Have you considered whether the genererated PYC files need a different magic number or some other way to indicate that they aren't production code?

Would it make sense to use a different sys.implementation.cache_tag? For example, the tag si currently "cpython-35". We can use "cpython-35P" when peephole optimizations are disabled. So you can have separated .pyc and .pyo files and the disabling peephole optimizations is compatible with -O and -OO command line options.

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nosy: +haypo

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<http://bugs.python.org/issue2506>
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