Tests that attempts by the DFG simplification to short-circuit a Phantom to a GetLocal on a variable that is SetLocal'd in the same block, and where the predecessor block(s) make no mention of that variable, do not result in crashes.

On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".


PASS thingy(o) is 42 on all iterations including after DFG tier-up.
PASS successfullyParsed is true

TEST COMPLETE