[RemoveDIs][NFC] Rename DPValue -> DbgVariableRecord (#85216)

This is the major rename patch that prior patches have built towards.
The DPValue class is being renamed to DbgVariableRecord, which reflects
the updated terminology for the "final" implementation of the RemoveDI
feature. This is a pure string substitution + clang-format patch. The
only manual component of this patch was determining where to perform
these string substitutions: `DPValue` and `DPV` are almost exclusively
used for DbgRecords, *except* for:

- llvm/lib/target, where 'DP' is used to mean double-precision, and so
appears as part of .td files and in variable names. NB: There is a
single existing use of `DPValue` here that refers to debug info, which
I've manually updated.
- llvm/tools/gold, where 'LDPV' is used as a prefix for symbol
visibility enums.

Outside of these places, I've applied several basic string
substitutions, with the intent that they only affect DbgRecord-related
identifiers; I've checked them as I went through to verify this, with
reasonable confidence that there are no unintended changes that slipped
through the cracks. The substitutions applied are all case-sensitive,
and are applied in the order shown:

```
  DPValue -> DbgVariableRecord
  DPVal -> DbgVarRec
  DPV -> DVR
```

Following the previous rename patches, it should be the case that there
are no instances of any of these strings that are meant to refer to the
general case of DbgRecords, or anything other than the DPValue class.
The idea behind this patch is therefore that pure string substitution is
correct in all cases as long as these assumptions hold.

1 files changed, 2 insertions, 2 deletions

diff --git a/llvm/lib/CodeGen/SelectOptimize.cpp b/llvm/lib/CodeGen/SelectOptimize.cpp
index f65d532..2e03ae6 100644
--- a/llvm/lib/CodeGen/SelectOptimize.cpp
+++ b/llvm/lib/CodeGen/SelectOptimize.cpp
@@ -624,8 +624,8 @@ void SelectOptimizeImpl::convertProfitableSIGroups(SelectGroups &ProfSIGroups) {
     // With RemoveDIs turned off, SplitPt can be a dbg.* intrinsic. With
     // RemoveDIs turned on, SplitPt would instead point to the next
     // instruction. To match existing dbg.* intrinsic behaviour with RemoveDIs,
-    // tell splitBasicBlock that we want to include any DPValues attached to
-    // SplitPt in the splice.
+    // tell splitBasicBlock that we want to include any DbgVariableRecords
+    // attached to SplitPt in the splice.
     SplitPt.setHeadBit(true);
     BasicBlock *EndBlock = StartBlock->splitBasicBlock(SplitPt, "select.end");
     BFI->setBlockFreq(EndBlock, BFI->getBlockFreq(StartBlock));