[llvm] [CodeGen] Use BasicBlock numbers to map to MBBs (PR #101883)

[Nikita Popov via llvm-commits]

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@@ -3832,7 +3832,8 @@ static bool checkForMustTailInVarArgFn(bool IsVarArg, const BasicBlock &BB) {
 
 bool IRTranslator::runOnMachineFunction(MachineFunction &CurMF) {
   MF = &CurMF;
-  const Function &F = MF->getFunction();
+  Function &F = MF->getFunction();
+  F.renumberBlocks(); // renumber blocks for dense values
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nikic wrote:

Is this safe? I think machine passes will preserve all the IR analyses, including DT, which may still get used by machine passes (e.g. through AA).

https://github.com/llvm/llvm-project/pull/101883