[Tests] Do not ignore swiftsourceinfo by default in lit tests #37029
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This was added as a default in b103997,
with the reasoning that users do not have .swiftsourceinfo for the
stdlib. A later change (51d6243) then
avoids emitting .swiftsourceinfo for the stdlib at all, making this no longer an issue.
The compiler does use .swiftsourceinfo for user-built modules, so reading them by
default seems reasonable (with the option to disable them in the cases where that
causes an issue).