[llvm] [AArch64] Add check that prologue insertion doesn't clobber live regs. (PR #71826)

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git-clang-format --diff 7360d5d30fe75ee86696d1e9a8a62cb74b47254a 4321e9f2b9a18f4b117ad8859a429cb4901a2850 -- llvm/lib/Target/AArch64/AArch64FrameLowering.cpp
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View the diff from clang-format here.
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diff --git a/llvm/lib/Target/AArch64/AArch64FrameLowering.cpp b/llvm/lib/Target/AArch64/AArch64FrameLowering.cpp
index 87efb60b6ebb..816061dd32df 100644
--- a/llvm/lib/Target/AArch64/AArch64FrameLowering.cpp
+++ b/llvm/lib/Target/AArch64/AArch64FrameLowering.cpp
@@ -1420,7 +1420,8 @@ void AArch64FrameLowering::emitPrologue(MachineFunction &MF,
   // Collect live register from the end of MBB up to the start of the existing
   // frame setup instructions.
   MachineBasicBlock::iterator NonFrameStart = MBB.begin();
-  while (NonFrameStart != End && NonFrameStart->getFlag(MachineInstr::FrameSetup))
+  while (NonFrameStart != End &&
+         NonFrameStart->getFlag(MachineInstr::FrameSetup))
     ++NonFrameStart;
   LivePhysRegs LiveRegs(*TRI);
   if (NonFrameStart != MBB.end()) {

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https://github.com/llvm/llvm-project/pull/71826