Damien George 34c04d2319 py/nlrthumb: Save and restore VFP registers s16-s21 when CPU has them. ...

These s16-s21 registers are used by gcc so need to be saved.  Future
versions of gcc (beyond v9.1.0), or other compilers, may eventually need
additional registers saved/restored.

See issue #4844.

2019-06-19 14:53:17 +10:00

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