[llvm] Fix performance bug in buildLocationList (PR #108886)

[Adrian Prantl via llvm-commits]

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@@ -1737,6 +1737,12 @@ void AsmPrinter::emitFunctionBody() {
   bool IsEHa = MMI->getModule()->getModuleFlag("eh-asynch");
 
   bool CanDoExtraAnalysis = ORE->allowExtraAnalysis(DEBUG_TYPE);
+  /* Create a slot for the entry basic block section so that the section
+     order is preserved when iterating over MBBSectionRanges. */
+  if (!MF->empty()) {
+    MBBSectionRanges[MF->front().getSectionID()] = MBBSectionRange{CurrentFnBegin, nullptr};
+  }
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adrian-prantl wrote:

Can you update this to LLVM style (// versus /**/ and get rid of the {})?

https://github.com/llvm/llvm-project/pull/108886