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esp32/gccollect: Make level arg volatile to force recursive function.

Phileas requested to merge esp32_mp_backport_improvements_to_gc_tracking_of_stack into main

Otherwise the compiler may inline the gc_collect_inner() function and/or remove the recursion, which is necessary to spill all the windowed registers to the C stack.

Closes #157 (closed) and #160 (closed)

Edited by Phileas

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