Make init() run before C++ static initializers #4
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Partially moved from arduino/Arduino#5592
eric-wieser commented on 12 Nov 2016
Before this change, the contents of init() run after .init6 which is when static initializers run.
However, this is not desirable:
init() does not need any C++ classes to be active
C++ static initialization sometimes does require that the hardware be pre-configured!
This makes it possible to make calls like Serial.begin() inside constructors of global variables.