[issue19512] Avoid temporary Unicode strings, use identifiers to only create the string once

[Roundup Robot]

Roundup Robot added the comment:

New changeset 77bebcf5c4cf by Victor Stinner in branch 'default':
Issue #19512: add _PyUnicode_CompareWithId() function
http://hg.python.org/cpython/rev/77bebcf5c4cf

New changeset 3f9f2cfae53b by Victor Stinner in branch 'default':
Issue #19512: Use the new _PyId_builtins identifier
http://hg.python.org/cpython/rev/3f9f2cfae53b

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<http://bugs.python.org/issue19512>
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