[llvm] [RISCV][NFC] Match `3/5/9 * 3/5/9 * 2^N` without a loop (PR #165547)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions cpp -- llvm/lib/Target/RISCV/RISCVISelLowering.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/Target/RISCV/RISCVISelLowering.cpp b/llvm/lib/Target/RISCV/RISCVISelLowering.cpp
index 426ac74f1..29b798641 100644
--- a/llvm/lib/Target/RISCV/RISCVISelLowering.cpp
+++ b/llvm/lib/Target/RISCV/RISCVISelLowering.cpp
@@ -16542,10 +16542,11 @@ static SDValue expandMul(SDNode *N, SelectionDAG &DAG,
   if (Subtarget.hasVendorXqciac() && isInt<12>(CNode->getSExtValue()))
     return SDValue();
 
-  // WARNING: The code below is knowingly incorrect with regards to undef semantics.
-  // We're adding additional uses of X here, and in principle, we should be freezing
-  // X before doing so.  However, adding freeze here causes real regressions, and no
-  // other target properly freezes X in these cases either.
+  // WARNING: The code below is knowingly incorrect with regards to undef
+  // semantics. We're adding additional uses of X here, and in principle, we
+  // should be freezing X before doing so.  However, adding freeze here causes
+  // real regressions, and no other target properly freezes X in these cases
+  // either.
   if (Subtarget.hasShlAdd(3)) {
     SDValue X = N->getOperand(0);
     int Shift;

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https://github.com/llvm/llvm-project/pull/165547