gc.c: Increase STACKFRAME_FOR_CALL_CFUNC
On macOS Mojave, the child process invoked in TestFiber#test_stack_size gets stuck because the stack overflow detection is too late. (ko1 figured out the mechanism of the failure.)
This change attempts to detect stack overflow earlier.
gc.c: Increase STACKFRAME_FOR_CALL_CFUNC
On macOS Mojave, the child process invoked in TestFiber#test_stack_size
gets stuck because the stack overflow detection is too late.
(ko1 figured out the mechanism of the failure.)
This change attempts to detect stack overflow earlier.