[wasm] Scan machine stack based on ec->machine.stack_{start,end}
fiber machine stack is placed outside of C stack allocated by wasm-ld,
so highest stack address recorded by rb_wasm_record_stack_base is
invalid when running on non-main fiber.
Therefore, we should scan stack_{start,end} which always point a valid
stack range in any context.
Added by katei (Yuta Saito) over 2 years ago
[wasm] Scan machine stack based on
ec->machine.stack_{start,end}fiber machine stack is placed outside of C stack allocated by wasm-ld,
so highest stack address recorded by
rb_wasm_record_stack_baseisinvalid when running on non-main fiber.
Therefore, we should scan
stack_{start,end}which always point a validstack range in any context.