[llvm] [GISel] Return const APInt & from getIConstantFromReg. NFC (PR #114320)

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``````````bash
git-clang-format --diff 74d8f3952c4acf6d57948983d7c5b0d0a7763c28 4ea5ac1e2e7af28f3236eab65e79089ba0011ac9 --extensions cpp,h -- llvm/include/llvm/CodeGen/GlobalISel/Utils.h llvm/lib/CodeGen/GlobalISel/Utils.cpp
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View the diff from clang-format here.
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``````````diff
diff --git a/llvm/lib/CodeGen/GlobalISel/Utils.cpp b/llvm/lib/CodeGen/GlobalISel/Utils.cpp
index 549cba02bb..5cee07461d 100644
--- a/llvm/lib/CodeGen/GlobalISel/Utils.cpp
+++ b/llvm/lib/CodeGen/GlobalISel/Utils.cpp
@@ -287,7 +287,8 @@ std::optional<APInt> llvm::getIConstantVRegVal(Register VReg,
   return ValAndVReg->Value;
 }
 
-const APInt &llvm::getIConstantFromReg(Register Reg, const MachineRegisterInfo &MRI) {
+const APInt &llvm::getIConstantFromReg(Register Reg,
+                                       const MachineRegisterInfo &MRI) {
   MachineInstr *Const = MRI.getVRegDef(Reg);
   assert((Const && Const->getOpcode() == TargetOpcode::G_CONSTANT) &&
          "expected a G_CONSTANT on Reg");

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https://github.com/llvm/llvm-project/pull/114320