[llvm] [RISCV][P-ext] Use pli.b when only the lower 2 bytes are used. (PR #192400)

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git-clang-format --diff origin/main HEAD --extensions cpp -- llvm/lib/Target/RISCV/RISCVISelDAGToDAG.cpp --diff_from_common_commit
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``````````diff
diff --git a/llvm/lib/Target/RISCV/RISCVISelDAGToDAG.cpp b/llvm/lib/Target/RISCV/RISCVISelDAGToDAG.cpp
index acdb05ae5..e42876981 100644
--- a/llvm/lib/Target/RISCV/RISCVISelDAGToDAG.cpp
+++ b/llvm/lib/Target/RISCV/RISCVISelDAGToDAG.cpp
@@ -1153,8 +1153,8 @@ void RISCVDAGToDAGISel::Select(SDNode *Node) {
 
       if (VT == MVT::i64 && Subtarget->hasStdExtP() && isApplicableToPLI(Imm) &&
           hasAllWUsers(Node)) {
-        // If it's 4 packed 8-bit integers or 2 packed signed 16-bit integers, we
-        // can simply copy lower 32 bits to higher 32 bits to make it able to
+        // If it's 4 packed 8-bit integers or 2 packed signed 16-bit integers,
+        // we can simply copy lower 32 bits to higher 32 bits to make it able to
         // rematerialize to PLI_B or PLI_H
         Imm = ((uint64_t)Imm << 32) | (Imm & 0xFFFFFFFF);
       }

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https://github.com/llvm/llvm-project/pull/192400