[llvm] AMDGPU: Add codegen for atomicrmw operations usub_cond and usub_sat (PR #141068)

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``````````bash
git-clang-format --diff HEAD~1 HEAD --extensions cpp -- llvm/lib/Target/AMDGPU/AMDGPUInstructionSelector.cpp llvm/lib/Target/AMDGPU/AMDGPULegalizerInfo.cpp llvm/lib/Target/AMDGPU/AMDGPULowerBufferFatPointers.cpp llvm/lib/Target/AMDGPU/AMDGPURegisterBankInfo.cpp llvm/lib/Target/AMDGPU/R600ISelLowering.cpp llvm/lib/Target/AMDGPU/SIISelLowering.cpp llvm/lib/Target/AMDGPU/Utils/AMDGPUBaseInfo.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/Target/AMDGPU/AMDGPULowerBufferFatPointers.cpp b/llvm/lib/Target/AMDGPU/AMDGPULowerBufferFatPointers.cpp
index b91200df0..cb0ca3a6d 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPULowerBufferFatPointers.cpp
+++ b/llvm/lib/Target/AMDGPU/AMDGPULowerBufferFatPointers.cpp
@@ -1773,8 +1773,9 @@ Value *SplitPtrStructs::handleMemoryInst(Instruction *I, Value *Arg, Value *Ptr,
       break;
     case AtomicRMWInst::UIncWrap:
     case AtomicRMWInst::UDecWrap:
-      reportFatalUsageError("wrapping increment/decrement not supported for "
-                            "buffer resources and should've been expanded away");
+      reportFatalUsageError(
+          "wrapping increment/decrement not supported for "
+          "buffer resources and should've been expanded away");
       break;
     case AtomicRMWInst::BAD_BINOP:
       llvm_unreachable("Not sure how we got a bad binop");

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https://github.com/llvm/llvm-project/pull/141068