[llvm] [AMDGPU] Skip lowerNonKernelLDSAccesses if function is declaration. (PR #106975)

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``````````bash
git-clang-format --diff e5a5ac0c2355df9911953260aaf519185efa369e c0356634af0a5d7b78f16fd07144fa941c93d6f5 --extensions cpp -- llvm/lib/Target/AMDGPU/AMDGPUSwLowerLDS.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/Target/AMDGPU/AMDGPUSwLowerLDS.cpp b/llvm/lib/Target/AMDGPU/AMDGPUSwLowerLDS.cpp
index b85cc9cbbc..ca796200ee 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPUSwLowerLDS.cpp
+++ b/llvm/lib/Target/AMDGPU/AMDGPUSwLowerLDS.cpp
@@ -1218,7 +1218,8 @@ bool AMDGPUSwLowerLDS::run() {
     for (auto &K : FuncLDSAccessInfo.NonKernelToLDSAccessMap) {
       Function *Func = K.first;
       DenseSet<GlobalVariable *> &LDSGlobals = K.second;
-      if (Func->isDeclaration() || LDSGlobals.empty()) continue;
+      if (Func->isDeclaration() || LDSGlobals.empty())
+        continue;
       SetVector<GlobalVariable *> OrderedLDSGlobals = sortByName(
           std::vector<GlobalVariable *>(LDSGlobals.begin(), LDSGlobals.end()));
       lowerNonKernelLDSAccesses(Func, OrderedLDSGlobals, NKLDSParams);
@@ -1227,7 +1228,8 @@ bool AMDGPUSwLowerLDS::run() {
       auto &K = FuncLDSAccessInfo.NonKernelToLDSAccessMap;
       if (K.find(Func) != K.end())
         continue;
-      if (Func->isDeclaration()) continue;
+      if (Func->isDeclaration())
+        continue;
       SetVector<llvm::GlobalVariable *> Vec;
       lowerNonKernelLDSAccesses(Func, Vec, NKLDSParams);
     }

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https://github.com/llvm/llvm-project/pull/106975