[clang-tools-extra] Clean up strange uses of getAnalysisIfAvailable (PR #65729)

[Jay Foad via cfe-commits]

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@@ -935,7 +935,7 @@ bool AArch64ConditionalCompares::runOnMachineFunction(MachineFunction &MF) {
   SchedModel = MF.getSubtarget().getSchedModel();
   MRI = &MF.getRegInfo();
   DomTree = &getAnalysis<MachineDominatorTree>();
-  Loops = getAnalysisIfAvailable<MachineLoopInfo>();
+  Loops = &getAnalysis<MachineLoopInfo>();
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jayfoad wrote:

Everything seems to work if I change `AArch64ConditionalCompares` to not require `MachineLoopInfo`. But I think I'll leave it to the AArch64 maintainers like you suggest.

https://github.com/llvm/llvm-project/pull/65729