[llvm] [LoongArch] Introduce PseudoAddUpperImm to deduplicate stack-frame base address materialization (PR #217250)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- llvm/lib/Target/LoongArch/LoongArchExpandPseudoInsts.cpp llvm/lib/Target/LoongArch/LoongArchRegisterInfo.cpp --diff_from_common_commit
``````````

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``````````diff
diff --git a/llvm/lib/Target/LoongArch/LoongArchExpandPseudoInsts.cpp b/llvm/lib/Target/LoongArch/LoongArchExpandPseudoInsts.cpp
index 92537c34c..0e18669b5 100644
--- a/llvm/lib/Target/LoongArch/LoongArchExpandPseudoInsts.cpp
+++ b/llvm/lib/Target/LoongArch/LoongArchExpandPseudoInsts.cpp
@@ -773,7 +773,7 @@ private:
                           MachineBasicBlock::iterator &NextMBBI,
                           bool IsTailCall);
   bool expandAddUpperImm(MachineBasicBlock &MBB,
-                        MachineBasicBlock::iterator MBBI);
+                         MachineBasicBlock::iterator MBBI);
 };
 
 char LoongArchExpandPseudo::ID = 0;

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https://github.com/llvm/llvm-project/pull/217250