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.

1 files changed, 1 insertions, 1 deletions

diff --git a/gc.c b/gc.c
index dbf19e0805..62c5c79738 100644
--- a/gc.c
+++ b/gc.c
@@ -4450,7 +4450,7 @@ stack_check(rb_execution_context_t *ec, int water_mark)
 #define stack_check(ec, water_mark) FALSE
 #endif
 
-#define STACKFRAME_FOR_CALL_CFUNC 838
+#define STACKFRAME_FOR_CALL_CFUNC 1024
 
 MJIT_FUNC_EXPORTED int
 rb_ec_stack_check(rb_execution_context_t *ec)