[llvm] [EarlyIfConversion] Determine if branch is predictable using new APIs. (PR #95877)

[Pengcheng Wang via llvm-commits]

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@@ -327,12 +328,27 @@ void AArch64InstrInfo::insertIndirectBranch(MachineBasicBlock &MBB,
       .addImm(16);
 }
 
-// Branch analysis.
+bool AArch64InstrInfo::isCondBranchPredictable(
+    const MachineInstr &CondBr, const MachineLoopInfo &MLI) const {
+  MachineLoop *Loop = MLI.getLoopFor(CondBr.getParent());
+  if (!Loop)
+    return false;
+  return Loop->isLoopInvariant(CondBr, /*ExcludeReg=*/0, /*RecursionDepth=*/2);
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wangpc-pp wrote:

Why is `RecursionDepth=2` here?

https://github.com/llvm/llvm-project/pull/95877