[issue2506] Add mechanism to disable optimizations

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

There are different optimizations on different levels (AST, bytecode generation, peepholer), would be nice to control them separately. This means that we should pass a bitset to the compiler.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue2506>
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