esp32: Trace the registers when doing a gc collect. Also make it thread ready.
esp32: Trace the registers when doing a gc collect. Also make it thread ready.

MrSurly/micropython-esp32,MrSurly/micropython-esp32,Peetz0r/micropython-esp32,micropython/micropython-esp32,Peetz0r/micropython-esp32,micropython/micropython-esp32,SHA2017-badge/micropython-esp32,micropython/micropython-esp32,MrSurly/micropython-esp32,SHA2017-badge/micropython-esp32,SHA2017-badge/micropython-esp32,MrSurly/micropython-esp32,MrSurly/micropython-esp32,SHA2017-badge/micropython-esp32,SHA2017-badge/micropython-esp32,Peetz0r/micropython-esp32,micropython/micropython-esp32,micropython/micropython-esp32,Peetz0r/micropython-esp32,Peetz0r/micropython-esp32