Use normal checkpoints for NotifyStartupCompleted

The API RunEmptyCheckpoint is only safe with one caller (the GC),
incorrect usage was resulting in occasional deadlocks.

The fix is to use a normal checkpoint to do the empty checkpoint.

Bug: 129150130
Test: test-art-host
Change-Id: I8ed73bc8b57c3493f4a995843d5ad63bd1a91ef8
1 file changed