[llvm] [llvm][RISCV] Support mulh for P extension codegen (PR #171581)

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<!--LLVM CODE FORMAT COMMENT: {clang-format}-->


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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 a89eb657b..cfe8b3168 100644
--- a/llvm/lib/Target/RISCV/RISCVISelLowering.cpp
+++ b/llvm/lib/Target/RISCV/RISCVISelLowering.cpp
@@ -16405,8 +16405,7 @@ static SDValue combinePExtTruncate(SDNode *N, SelectionDAG &DAG,
       // commuted case
       if (LHSIsZExt && RHSIsSExt)
         std::swap(A, B);
-    }
-    else
+    } else
       return SDValue();
     break;
   }

``````````

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https://github.com/llvm/llvm-project/pull/171581