[llvm] [PowerPC] Add custom lowering for SADD overflow for i32 and i64 (PR #159255)

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

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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 0798dae3a..4e4e9a9ab 100644
--- a/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
+++ b/llvm/lib/Target/PowerPC/PPCISelLowering.cpp
@@ -205,7 +205,7 @@ PPCTargetLowering::PPCTargetLowering(const PPCTargetMachine &TM,
   if (!Subtarget.hasP10Vector()) {
     setOperationAction(ISD::SSUBO, MVT::i32, Custom);
     setOperationAction(ISD::SADDO, MVT::i32, Custom);
-    if (isPPC64){
+    if (isPPC64) {
       setOperationAction(ISD::SSUBO, MVT::i64, Custom);
       setOperationAction(ISD::SADDO, MVT::i64, Custom);
     }

``````````

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https://github.com/llvm/llvm-project/pull/159255