[llvm] [AMDGPU] Fix SSID merge in SIMemoryLegalizer to use smallest inclusiv… (PR #208300)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions h,cpp -- llvm/lib/Target/AMDGPU/AMDGPUMachineModuleInfo.h llvm/lib/Target/AMDGPU/SIMemoryLegalizer.cpp --diff_from_common_commit
``````````

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``````````diff
diff --git a/llvm/lib/Target/AMDGPU/AMDGPUMachineModuleInfo.h b/llvm/lib/Target/AMDGPU/AMDGPUMachineModuleInfo.h
index 5062fd8f0..eb77f11ad 100644
--- a/llvm/lib/Target/AMDGPU/AMDGPUMachineModuleInfo.h
+++ b/llvm/lib/Target/AMDGPU/AMDGPUMachineModuleInfo.h
@@ -122,8 +122,7 @@ public:
 
     // Returns {level, isOneAS} for a given scope, or nullopt if unsupported.
     auto GetLevelAndOneAS =
-        [&](SyncScope::ID SSID)
-        -> std::optional<std::pair<unsigned, bool>> {
+        [&](SyncScope::ID SSID) -> std::optional<std::pair<unsigned, bool>> {
       for (unsigned I = 0; I < std::size(CrossAS); ++I) {
         if (CrossAS[I] == SSID)
           return std::make_pair(I, false);

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https://github.com/llvm/llvm-project/pull/208300