Revert^4 "Thread suspension cleanup and deadlock fix"

This reverts commit ebd76406bf5fa74185998bc29f0f27c20fa2e683.

PS1 is identical to aosp/2216806.

PS2 in addition converts the RunCheckpoint call used from
StackUtil::GetAllStackTraces to RunCheckpointUnchecked to temporarily
work around another checkpoint Run() function lock ordering
issue.

PS3 is a nontrivial rebase.

Test: Build and boot AOSP, Treehugger
Bug: 240742796
Bug: 203363895
Bug: 238032384
Bug: 253671779

Change-Id: I38385e41392652cc30e5e74fd8b93e22088827a5
24 files changed