Revert "[DebugInfo] Drop DBG_VALUE_LISTs with an excessive number of debug operands"

This reverts commit b623df3c93983c4512aa54f2c706716bdf865a90, as per
https://llvm.org/docs/DeveloperPolicy.html#patch-reversion-policy.

Breakages observed downstream reported in:
https://reviews.llvm.org/D91722#2724321

Fixes exist in:
https://reviews.llvm.org/D101523
https://reviews.llvm.org/D101540

but haven't landed yet going into the weekend.