Revert "ARM64 asm for region space array allocation"

This change breaks many tests on the ARM64 concurrent
collector configuration.

Bug: 30162165
Bug: 12687968

This reverts commit f686c3feabe3519bedd1f3001e5dd598f46946ef.

Change-Id: I5d7ef5fa2ffb6a8d9a4d3adbcc14854efa257313
5 files changed