[issue29312] Use FASTCALL in dict.update()

[Inada Naoki]

Inada Naoki <songofacandy at gmail.com> added the comment:

- d2 = dict(**d1)
+ d2 = {"fizz": "buzz"}
+ d2.update(**d1)

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue29312>
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