[llvm] [PowerPC] Initial support of tail call optimization on AIXDigger/tail call (PR #161690)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- llvm/lib/Target/PowerPC/PPCFrameLowering.cpp llvm/lib/Target/PowerPC/PPCISelLowering.cpp
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/Target/PowerPC/PPCISelLowering.cpp b/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
index a35cdf4e2..226dc4211 100644
--- a/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
+++ b/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
@@ -7837,13 +7837,13 @@ SDValue PPCTargetLowering::LowerCall_AIX(
 
     if (VA.isMemLoc()) {
       if (!CFlags.IsTailCall) {
-      SDValue PtrOff =
-          DAG.getConstant(VA.getLocMemOffset(), dl, StackPtr.getValueType());
-      PtrOff = DAG.getNode(ISD::ADD, dl, PtrVT, StackPtr, PtrOff);
-      MemOpChains.push_back(
-          DAG.getStore(Chain, dl, Arg, PtrOff,
-                       MachinePointerInfo::getStack(MF, VA.getLocMemOffset()),
-                       Subtarget.getFrameLowering()->getStackAlign()));
+        SDValue PtrOff =
+            DAG.getConstant(VA.getLocMemOffset(), dl, StackPtr.getValueType());
+        PtrOff = DAG.getNode(ISD::ADD, dl, PtrVT, StackPtr, PtrOff);
+        MemOpChains.push_back(
+            DAG.getStore(Chain, dl, Arg, PtrOff,
+                         MachinePointerInfo::getStack(MF, VA.getLocMemOffset()),
+                         Subtarget.getFrameLowering()->getStackAlign()));
       } else
         CalculateTailCallArgDest(DAG, MF, false, Arg, SPDiff,
                                  VA.getLocMemOffset(), TailCallArguments);

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https://github.com/llvm/llvm-project/pull/161690