Make assertions allow incremental GC when disabled

When assertions are enabled, the following code triggers an assertion
error:

    GC.disable
    GC.start(immediate_mark: false, immediate_sweep: false)

    10_000_000.times { Object.new }

This is because the GC.start ignores that the GC is disabled and will
start incremental marking and lazy sweeping. But the assertions in
gc_marks_continue and gc_sweep_continue assert that GC is not disabled.

This commit changes it for the assertion to pass if the GC was triggered
from a method.

0 files changed, 0 insertions, 0 deletions