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Describe the bug
Fury use long to merge 5 bytes writing into one operation, but it just increase index by 4 bytes for interpreter mode. JIT mode has increased index by 8 bytes. If a number happen to be encoded using 5 bytes and the buffer left is less than 8 bytes, fury using unsafe.putLong, which may crash the jvm.

The early G1ParScanThreadState::copy_to_survivor_space crash in #923 may be caused by this bug too.

Expected behavior
Grow 8 bytes early.

To Reproduce
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Environment (please complete the following information):
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