paycheck: Check MOVE operations for start block 0.

paycheck now blocks payloads that read or write to block 0 in a MOVE
operation. It must do this because old versions of PReadAll and
PWriteAll could not seek to 0.

TEST=unit tests,

Change-Id: I042de444c92896496795af235e9386dca6c77be2
Reviewed-by: Gilad Arnold <>
Reviewed-by: Alex Deymo <>
Commit-Queue: Allie Wood <>
Trybot-Ready: Allie Wood <>
Tested-by: Allie Wood <>
2 files changed