[llvm] Do not use R12 for indirect tail calls with PACBTI (PR #82661)

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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


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``````````bash
git-clang-format --diff f0dbcfe3526e2d8e1c4863828877ac21e08023a0 1f31ecc1240aabaa9ae1dcc9c6d98c93a555f103 -- llvm/lib/Target/ARM/ARMBaseInstrInfo.h llvm/lib/Target/ARM/ARMExpandPseudoInsts.cpp llvm/lib/Target/ARM/ARMFrameLowering.cpp llvm/lib/Target/ARM/ARMRegisterBankInfo.cpp llvm/lib/Target/ARM/Thumb1FrameLowering.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/Target/ARM/ARMExpandPseudoInsts.cpp b/llvm/lib/Target/ARM/ARMExpandPseudoInsts.cpp
index 9eaf47c071..df10613fcc 100644
--- a/llvm/lib/Target/ARM/ARMExpandPseudoInsts.cpp
+++ b/llvm/lib/Target/ARM/ARMExpandPseudoInsts.cpp
@@ -2242,7 +2242,8 @@ bool ARMExpandPseudo::ExpandMI(MachineBasicBlock &MBB,
         // Add the default predicate in Thumb mode.
         if (STI->isThumb())
           MIB.add(predOps(ARMCC::AL));
-      } else if (RetOpcode == ARM::TCRETURNri || RetOpcode == ARM::TCRETURNrinotr12) {
+      } else if (RetOpcode == ARM::TCRETURNri ||
+                 RetOpcode == ARM::TCRETURNrinotr12) {
         unsigned Opcode =
           STI->isThumb() ? ARM::tTAILJMPr
                          : (STI->hasV4TOps() ? ARM::TAILJMPr : ARM::TAILJMPr4);
diff --git a/llvm/lib/Target/ARM/ARMFrameLowering.cpp b/llvm/lib/Target/ARM/ARMFrameLowering.cpp
index f1b3619405..425a5535b4 100644
--- a/llvm/lib/Target/ARM/ARMFrameLowering.cpp
+++ b/llvm/lib/Target/ARM/ARMFrameLowering.cpp
@@ -1617,7 +1617,9 @@ void ARMFrameLowering::emitPopInst(MachineBasicBlock &MBB,
   if (MBB.end() != MI) {
     DL = MI->getDebugLoc();
     unsigned RetOpcode = MI->getOpcode();
-    isTailCall = (RetOpcode == ARM::TCRETURNdi || RetOpcode == ARM::TCRETURNri || RetOpcode == ARM::TCRETURNrinotr12);
+    isTailCall =
+        (RetOpcode == ARM::TCRETURNdi || RetOpcode == ARM::TCRETURNri ||
+         RetOpcode == ARM::TCRETURNrinotr12);
     isInterrupt =
         RetOpcode == ARM::SUBS_PC_LR || RetOpcode == ARM::t2SUBS_PC_LR;
     isTrap =
diff --git a/llvm/lib/Target/ARM/Thumb1FrameLowering.cpp b/llvm/lib/Target/ARM/Thumb1FrameLowering.cpp
index 0b683df700..366173cc65 100644
--- a/llvm/lib/Target/ARM/Thumb1FrameLowering.cpp
+++ b/llvm/lib/Target/ARM/Thumb1FrameLowering.cpp
@@ -1049,11 +1049,9 @@ static void popRegsFromStack(MachineBasicBlock &MBB,
         continue;
 
       if (Reg == ARM::LR) {
-        if (!MBB.succ_empty() ||
-            MI->getOpcode() == ARM::TCRETURNdi ||
+        if (!MBB.succ_empty() || MI->getOpcode() == ARM::TCRETURNdi ||
             MI->getOpcode() == ARM::TCRETURNri ||
-            MI->getOpcode() == ARM::TCRETURNrinotr12
-         )
+            MI->getOpcode() == ARM::TCRETURNrinotr12)
           // LR may only be popped into PC, as part of return sequence.
           // If this isn't the return sequence, we'll need emitPopSpecialFixUp
           // to restore LR the hard way.

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https://github.com/llvm/llvm-project/pull/82661