[clang] [llvm] [RISCV] Support Packed Multiplication with Horizontal Addition (PR #218430)

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``````````bash
git-clang-format --diff origin/main HEAD --extensions h,c,cpp -- clang/lib/CodeGen/TargetBuiltins/RISCV.cpp clang/lib/Headers/riscv_packed_simd.h cross-project-tests/intrinsic-header-tests/riscv_packed_simd.c 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 8f80fbfa5..f049bf72b 100644
--- a/llvm/lib/Target/RISCV/RISCVISelLowering.cpp
+++ b/llvm/lib/Target/RISCV/RISCVISelLowering.cpp
@@ -12257,8 +12257,7 @@ static unsigned getRVPMulHighAccumulateOpcode(unsigned IntNo) {
 static unsigned getRVPHorizontalMulOpcode(unsigned IntNo) {
   switch (IntNo) {
   default:
-    llvm_unreachable(
-        "Unexpected RISC-V packed horizontal multiply intrinsic");
+    llvm_unreachable("Unexpected RISC-V packed horizontal multiply intrinsic");
   case Intrinsic::riscv_pm4add:
     return RISCVISD::PM4ADD;
   case Intrinsic::riscv_pm2add:

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https://github.com/llvm/llvm-project/pull/218430