[llvm] [DLCov][NFC] Annotate intentionally-blank DebugLocs in existing code (PR #136192)

[Orlando Cazalet-Hyams via llvm-commits]

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@@ -1527,6 +1527,7 @@ bool IndVarSimplify::canonicalizeExitCondition(Loop *L) {
       auto *NewRHS = CastInst::Create(
           Instruction::Trunc, RHS, LHSOp->getType(), "",
           L->getLoopPreheader()->getTerminator()->getIterator());
+      NewRHS->setDebugLoc(DebugLoc::getDropped());
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OCHyams wrote:

Is dropped right here, why not `getCompilerGenerated`? (and are there docs / comments explain which to use?)

https://github.com/llvm/llvm-project/pull/136192