Repply#2 "[RemoveDIs] Load into new debug info format by default in LLVM (#89799)"

Reapplies the original commit:
  2f01fd99

The previous application of this patch failed due to some missing
DbgVariableRecord support in clang, which has been added now by commit
8805465e.

This will probably break some downstream tools that don't already handle
debug records. If your downstream code breaks as a result of this
change, the simplest fix is to convert the module in question to the old
debug format before you process it, using
`Module::convertFromNewDbgValues()`. For more information about how to
handle debug records or about what has changed, see the migration
document:
    https://llvm.org/docs/RemoveDIsDebugInfo.html

This reverts commit 4fd319ae.