Function ulConfigSetMinLargeHeapSize 

pub unsafe extern "C" fn ulConfigSetMinLargeHeapSize(
    config: ULConfig,
    size: c_uint,
)

The minimum size of large VM heaps in JavaScriptCore.

Set this to a lower value to make these heaps start with a smaller initial value.

(Default = 32 * 1024 * 1024)