Handle failure to reserve pre-reserved section when initializing server thread context. OS#15209418 #5536
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If we failed to reserve memory for the pre-reserved section when initializing the jit server thread context, when the jit process does the reservation, the client process has no way of knowing the start address of the pre-reserved section.
Instead, don't try to allocate memory for jitted code in pre-reserved section if we couldn't reserve when initializing server thread context