[mypyc] Intern string literals #9960
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This makes us more compatible with CPython, which interns (some)
string literals.
This speeds up some microbenchmarks slightly, by around 0.5-2%.
This may give a bigger speed win when calling functions using
vectorcalls and keyword arguments, but we'll see about that once that's
supported. Vectorcall argument parsing code has a fast path for interned
keyword argument names.