The test run time jumped from ~200s to ~600s on Linux.
Unfortunately I could not reproduce this locally.
But what I saw is that ARCSequenceOpts is taking 75% of the compile time: rdar://144863155
Let's increase the timeout a bit until we can get rid of ARCSequenceOpts.
rdar://144810758
It turns out that some CI jobs need 5-6 minutes for this test. To give some slack, use a timeout of 10 minutes.
This is a follow-up of https://github.com/swiftlang/swift/pull/76146
Fixes a compile time problem. The single linked list of merge targets in connection graph nodes can be very large.
Update the final merge target in the map, so that it has to be traversed only once for a given SILValue.
rdar://problem/71602804
