[issue10000] mark more tests as CPython specific

[Amaury Forgeot d'Arc]

New submission from Amaury Forgeot d'Arc <amauryfa at gmail.com>:

When porting pypy to 2.7, we found that many tests actually exercise features specific to CPython, either the garbage collector, or the precise memory layout (__sizeof__).
They should be marked as such, and skipped when run with pypy.

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messages: 117746
nosy: amaury.forgeotdarc
priority: normal
severity: normal
status: open
title: mark more tests as CPython specific

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue10000>
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