[issue38015] inline function generates slightly inefficient machine code

[Greg Price]

Greg Price <gnprice at gmail.com> added the comment:

See followup at https://bugs.python.org/issue38205 and https://bugs.python.org/issue37812#msg352670 .

The patch in GH-15710 had a side effect of introducing a call to `Py_UNREACHABLE` inside a comma-expression.  A subsequent commit 3ab61473b changed `Py_UNREACHABLE` in a way that made that a syntax error; the issue wasn't caught then because the code is only compiled if `NSMALLNEGINTS + NSMALLPOSINTS <= 0`.  Detailed discussion on those threads.

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<https://bugs.python.org/issue38015>
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