[llvm] [SandboxIR] Add missing export to symbol used in test (PR #225505)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- llvm/lib/SandboxIR/Instruction.cpp --diff_from_common_commit
``````````

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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/SandboxIR/Instruction.cpp b/llvm/lib/SandboxIR/Instruction.cpp
index 226ef9e55..e75672076 100644
--- a/llvm/lib/SandboxIR/Instruction.cpp
+++ b/llvm/lib/SandboxIR/Instruction.cpp
@@ -1164,8 +1164,8 @@ SwitchInst::CaseHandleImpl<LLVMCaseItT, BlockT, ConstT>::getCaseSuccessor()
   return cast<BlockT>(Ctx.getValue(LLVMBB));
 }
 
-template class LLVM_ABI_FOR_TEST SwitchInst::CaseHandleImpl<llvm::SwitchInst::CaseIt, BasicBlock,
-                                          ConstantInt>;
+template class LLVM_ABI_FOR_TEST SwitchInst::CaseHandleImpl<
+    llvm::SwitchInst::CaseIt, BasicBlock, ConstantInt>;
 template class SwitchInst::CaseItImpl<llvm::SwitchInst::CaseIt, BasicBlock,
                                       ConstantInt>;
 template class SwitchInst::CaseHandleImpl<llvm::SwitchInst::ConstCaseIt,

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https://github.com/llvm/llvm-project/pull/225505