Don't alloc memory in panic handler #735
Description
If we panic in guest due to running out of memory, allocating inside the panich andler will cause another panic, causing infinite panic recursion until the stack is overflown and we hit a guard page, which exits as a Stackoverflow error.
Our current tests for running out of memory tries to allocate a huge chunk which fails, but the allocation inside the panic handler succeeds because it's way smaller than the first one... :/