[issue16286] Use hash if available to optimize a==b and a!=b for bytes and str

[STINNER Victor]

STINNER Victor added the comment:

I added recently a new _PyUnicode_CompareWithId() function: changeset 77bebcf5c4cf (issue #19512).

This function can be used instead of PyUnicode_CompareWithASCIIString() when the right parameter is a common string. It is interesting when the right string is probably present in a dictionary. For example, "path" is always present as "sys.path". So interning the string doesn't eat more memory.

_PyUnicode_CompareWithId() would be more efficient with compare_hash-3.patch. The function is not used yet in critical path. It is now used in type_new() for example.

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<http://bugs.python.org/issue16286>
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