[clang] [llvm] [polly] [NFC][DebugInfo] Use iterator moveBefore at many call-sites (PR #123583)

[Orlando Cazalet-Hyams via cfe-commits]

================
@@ -8890,21 +8890,21 @@ bool 
CodeGenPrepare::fixupDbgVariableRecord(DbgVariableRecord &DVR) {
   return AnyChange;
 }
 
-static void DbgInserterHelper(DbgValueInst *DVI, Instruction *VI) {
+static void DbgInserterHelper(DbgValueInst *DVI, BasicBlock::iterator VI) {
   DVI->removeFromParent();
   if (isa<PHINode>(VI))
-    DVI->insertBefore(&*VI->getParent()->getFirstInsertionPt());
+    DVI->insertBefore(VI->getParent()->getFirstInsertionPt());
   else
     DVI->insertAfter(VI);
 }
 
-static void DbgInserterHelper(DbgVariableRecord *DVR, Instruction *VI) {
+static void DbgInserterHelper(DbgVariableRecord *DVR, BasicBlock::iterator VI) 
{
   DVR->removeFromParent();
   BasicBlock *VIBB = VI->getParent();
   if (isa<PHINode>(VI))
     VIBB->insertDbgRecordBefore(DVR, VIBB->getFirstInsertionPt());
   else
-    VIBB->insertDbgRecordAfter(DVR, VI);
+    VIBB->insertDbgRecordAfter(DVR, &*VI);
----------------
OCHyams wrote:

Is this a code-transition-state bug, or is there some reason we've got to use 
the Instruction * overload here? I suppose it doesn't matter either way for dbg 
records.

https://github.com/llvm/llvm-project/pull/123583
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