[clang] [llvm] [RISCV][P-ext] Support Packed Narrowing Zip (PR #210040)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions c,h,cpp -- clang/lib/Headers/riscv_packed_simd.h clang/test/CodeGen/RISCV/rvp-intrinsics.c cross-project-tests/intrinsic-header-tests/riscv_packed_simd.c llvm/lib/Target/RISCV/RISCVISelLowering.cpp --diff_from_common_commit
``````````

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in a stack if you are using a stacked PR workflow. You can limit the results by
changing `origin/main` to the base branch/commit you want to compare against.
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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 1261c9cbf..7b37bde2a 100644
--- a/llvm/lib/Target/RISCV/RISCVISelLowering.cpp
+++ b/llvm/lib/Target/RISCV/RISCVISelLowering.cpp
@@ -6604,10 +6604,10 @@ SDValue RISCVTargetLowering::lowerVECTOR_SHUFFLE(SDValue Op,
       return V;
     if (SDValue V =
             lowerVECTOR_SHUFFLEAsRV32PNarrowingShift(SVN, Subtarget, DAG))
-    if (SDValue V =
-            lowerVECTOR_SHUFFLEAsPNarrowingZip(SVN, DAG, Subtarget.is64Bit()))
-    if (SDValue V = lowerVECTOR_SHUFFLEAsPNarrowingZip(SVN, DAG))
-      return V;
+      if (SDValue V =
+              lowerVECTOR_SHUFFLEAsPNarrowingZip(SVN, DAG, Subtarget.is64Bit()))
+        if (SDValue V = lowerVECTOR_SHUFFLEAsPNarrowingZip(SVN, DAG))
+          return V;
     if (SDValue V = lowerVECTOR_SHUFFLEAsPZip(SVN, DAG))
       return V;
     return SDValue();

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https://github.com/llvm/llvm-project/pull/210040