Deduplicate intrinsics with side effects when they're under the same predicate

[TomAFrench]

We currently do not deduplicate any intrinics which have side effects. This results in us not deduplicating instrinsics which we should be able to (example given in #6527 where we do not deduplicate Intrinsic::ToRadix calls of the same variable in the same block).

We essentially need to make deduplication of these instructions aware of deduplicate_with_predicate similarly to how we do for other instructions.

[jfecher]

We can add the && deduplicate_with_predicate clause but we also need to actually match on them more closely in that case since we still wouldn't want to deduplicate e.g. println(1)

[TomAFrench]

I don't think we have any intrinsics which result in foreign calls afaik but agreed in general that we should be careful when deduplicating these.