Turn certain assertion errors in mpy-cross into SyntaxErrors #2670
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Before this, such names would instead cause an assertion error inside qstr_from_strn. A simple reproducer is a python source file containing the letter "a" repeated 256 times
…nc def' A simple reproducer is: async for x in():x
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Some time back, I fuzz-tested mpy-cross, and found two classes of crash due assertion failures. These changes turn those failures into SyntaxErrors instead. They may also fix an assertion failure crash on real devices.